fs/nfs/nfs4proc.c

   1 /*
   2  *  fs/nfs/nfs4proc.c
   3  *
   4  *  Client-side procedure declarations for NFSv4.
   5  *
   6  *  Copyright (c) 2002 The Regents of the University of Michigan.
   7  *  All rights reserved.
   8  *
   9  *  Kendrick Smith <kmsmith@umich.edu>
  10  *  Andy Adamson   <andros@umich.edu>
  11  *
  12  *  Redistribution and use in source and binary forms, with or without
  13  *  modification, are permitted provided that the following conditions
  14  *  are met:
  15  *
  16  *  1. Redistributions of source code must retain the above copyright
  17  *     notice, this list of conditions and the following disclaimer.
  18  *  2. Redistributions in binary form must reproduce the above copyright
  19  *     notice, this list of conditions and the following disclaimer in the
  20  *     documentation and/or other materials provided with the distribution.
  21  *  3. Neither the name of the University nor the names of its
  22  *     contributors may be used to endorse or promote products derived
  23  *     from this software without specific prior written permission.
  24  *
  25  *  THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
  26  *  WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
  27  *  MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
  28  *  DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  29  *  FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  30  *  CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  31  *  SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
  32  *  BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
  33  *  LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
  34  *  NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
  35  *  SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  36  */
  37
  38 #include <linux/mm.h>
  39 #include <linux/delay.h>
  40 #include <linux/errno.h>
  41 #include <linux/string.h>
  42 #include <linux/ratelimit.h>
  43 #include <linux/printk.h>
  44 #include <linux/slab.h>
  45 #include <linux/sunrpc/clnt.h>
  46 #include <linux/nfs.h>
  47 #include <linux/nfs4.h>
  48 #include <linux/nfs_fs.h>
  49 #include <linux/nfs_page.h>
  50 #include <linux/nfs_mount.h>
  51 #include <linux/namei.h>
  52 #include <linux/mount.h>
  53 #include <linux/module.h>
  54 #include <linux/xattr.h>
  55 #include <linux/utsname.h>
  56 #include <linux/freezer.h>
  57 #include <linux/iversion.h>
  58
  59 #include "nfs4_fs.h"
  60 #include "delegation.h"
  61 #include "internal.h"
  62 #include "iostat.h"
  63 #include "callback.h"
  64 #include "pnfs.h"
  65 #include "netns.h"
  66 #include "sysfs.h"
  67 #include "nfs4idmap.h"
  68 #include "nfs4session.h"
  69 #include "fscache.h"
  70 #include "nfs42.h"
  71
  72 #include "nfs4trace.h"
  73
  74 #define NFSDBG_FACILITY         NFSDBG_PROC
  75
  76 #define NFS4_BITMASK_SZ         3
  77
  78 #define NFS4_POLL_RETRY_MIN     (HZ/10)
  79 #define NFS4_POLL_RETRY_MAX     (15*HZ)
  80
  81 /* file attributes which can be mapped to nfs attributes */
  82 #define NFS4_VALID_ATTRS (ATTR_MODE \
  83         | ATTR_UID \
  84         | ATTR_GID \
  85         | ATTR_SIZE \
  86         | ATTR_ATIME \
  87         | ATTR_MTIME \
  88         | ATTR_CTIME \
  89         | ATTR_ATIME_SET \
  90         | ATTR_MTIME_SET)
  91
  92 struct nfs4_opendata;
  93 static int _nfs4_recover_proc_open(struct nfs4_opendata *data);
  94 static int nfs4_do_fsinfo(struct nfs_server *, struct nfs_fh *, struct nfs_fsinfo *);
  95 static void nfs_fixup_referral_attributes(struct nfs_fattr *fattr);
  96 static int _nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle,
  97                               struct nfs_fattr *fattr, struct inode *inode);
  98 static int nfs4_do_setattr(struct inode *inode, const struct cred *cred,
  99                             struct nfs_fattr *fattr, struct iattr *sattr,
 100                             struct nfs_open_context *ctx, struct nfs4_label *ilabel);
 101 #ifdef CONFIG_NFS_V4_1
 102 static struct rpc_task *_nfs41_proc_sequence(struct nfs_client *clp,
 103                 const struct cred *cred,
 104                 struct nfs4_slot *slot,
 105                 bool is_privileged);
 106 static int nfs41_test_stateid(struct nfs_server *, nfs4_stateid *,
 107                 const struct cred *);
 108 static int nfs41_free_stateid(struct nfs_server *, const nfs4_stateid *,
 109                 const struct cred *, bool);
 110 #endif
 111
 112 #ifdef CONFIG_NFS_V4_SECURITY_LABEL
 113 static inline struct nfs4_label *
 114 nfs4_label_init_security(struct inode *dir, struct dentry *dentry,
 115         struct iattr *sattr, struct nfs4_label *label)
 116 {
 117         int err;
 118
 119         if (label == NULL)
 120                 return NULL;
 121
 122         if (nfs_server_capable(dir, NFS_CAP_SECURITY_LABEL) == 0)
 123                 return NULL;
 124
 125         label->lfs = 0;
 126         label->pi = 0;
 127         label->len = 0;
 128         label->label = NULL;
 129
 130         err = security_dentry_init_security(dentry, sattr->ia_mode,
 131                                 &dentry->d_name, NULL,
 132                                 (void **)&label->label, &label->len);
 133         if (err == 0)
 134                 return label;
 135
 136         return NULL;
 137 }
 138 static inline void
 139 nfs4_label_release_security(struct nfs4_label *label)
 140 {
 141         if (label)
 142                 security_release_secctx(label->label, label->len);
 143 }
 144 static inline u32 *nfs4_bitmask(struct nfs_server *server, struct nfs4_label *label)
 145 {
 146         if (label)
 147                 return server->attr_bitmask;
 148
 149         return server->attr_bitmask_nl;
 150 }
 151 #else
 152 static inline struct nfs4_label *
 153 nfs4_label_init_security(struct inode *dir, struct dentry *dentry,
 154         struct iattr *sattr, struct nfs4_label *l)
 155 { return NULL; }
 156 static inline void
 157 nfs4_label_release_security(struct nfs4_label *label)
 158 { return; }
 159 static inline u32 *
 160 nfs4_bitmask(struct nfs_server *server, struct nfs4_label *label)
 161 { return server->attr_bitmask; }
 162 #endif
 163
 164 /* Prevent leaks of NFSv4 errors into userland */
 165 static int nfs4_map_errors(int err)
 166 {
 167         if (err >= -1000)
 168                 return err;
 169         switch (err) {
 170         case -NFS4ERR_RESOURCE:
 171         case -NFS4ERR_LAYOUTTRYLATER:
 172         case -NFS4ERR_RECALLCONFLICT:
 173                 return -EREMOTEIO;
 174         case -NFS4ERR_WRONGSEC:
 175         case -NFS4ERR_WRONG_CRED:
 176                 return -EPERM;
 177         case -NFS4ERR_BADOWNER:
 178         case -NFS4ERR_BADNAME:
 179                 return -EINVAL;
 180         case -NFS4ERR_SHARE_DENIED:
 181                 return -EACCES;
 182         case -NFS4ERR_MINOR_VERS_MISMATCH:
 183                 return -EPROTONOSUPPORT;
 184         case -NFS4ERR_FILE_OPEN:
 185                 return -EBUSY;
 186         case -NFS4ERR_NOT_SAME:
 187                 return -ENOTSYNC;
 188         default:
 189                 dprintk("%s could not handle NFSv4 error %d\n",
 190                                 __func__, -err);
 191                 break;
 192         }
 193         return -EIO;
 194 }
 195
 196 /*
 197  * This is our standard bitmap for GETATTR requests.
 198  */
 199 const u32 nfs4_fattr_bitmap[3] = {
 200         FATTR4_WORD0_TYPE
 201         | FATTR4_WORD0_CHANGE
 202         | FATTR4_WORD0_SIZE
 203         | FATTR4_WORD0_FSID
 204         | FATTR4_WORD0_FILEID,
 205         FATTR4_WORD1_MODE
 206         | FATTR4_WORD1_NUMLINKS
 207         | FATTR4_WORD1_OWNER
 208         | FATTR4_WORD1_OWNER_GROUP
 209         | FATTR4_WORD1_RAWDEV
 210         | FATTR4_WORD1_SPACE_USED
 211         | FATTR4_WORD1_TIME_ACCESS
 212         | FATTR4_WORD1_TIME_METADATA
 213         | FATTR4_WORD1_TIME_MODIFY
 214         | FATTR4_WORD1_MOUNTED_ON_FILEID,
 215 #ifdef CONFIG_NFS_V4_SECURITY_LABEL
 216         FATTR4_WORD2_SECURITY_LABEL
 217 #endif
 218 };
 219
 220 static const u32 nfs4_pnfs_open_bitmap[3] = {
 221         FATTR4_WORD0_TYPE
 222         | FATTR4_WORD0_CHANGE
 223         | FATTR4_WORD0_SIZE
 224         | FATTR4_WORD0_FSID
 225         | FATTR4_WORD0_FILEID,
 226         FATTR4_WORD1_MODE
 227         | FATTR4_WORD1_NUMLINKS
 228         | FATTR4_WORD1_OWNER
 229         | FATTR4_WORD1_OWNER_GROUP
 230         | FATTR4_WORD1_RAWDEV
 231         | FATTR4_WORD1_SPACE_USED
 232         | FATTR4_WORD1_TIME_ACCESS
 233         | FATTR4_WORD1_TIME_METADATA
 234         | FATTR4_WORD1_TIME_MODIFY,
 235         FATTR4_WORD2_MDSTHRESHOLD
 236 #ifdef CONFIG_NFS_V4_SECURITY_LABEL
 237         | FATTR4_WORD2_SECURITY_LABEL
 238 #endif
 239 };
 240
 241 static const u32 nfs4_open_noattr_bitmap[3] = {
 242         FATTR4_WORD0_TYPE
 243         | FATTR4_WORD0_FILEID,
 244 };
 245
 246 const u32 nfs4_statfs_bitmap[3] = {
 247         FATTR4_WORD0_FILES_AVAIL
 248         | FATTR4_WORD0_FILES_FREE
 249         | FATTR4_WORD0_FILES_TOTAL,
 250         FATTR4_WORD1_SPACE_AVAIL
 251         | FATTR4_WORD1_SPACE_FREE
 252         | FATTR4_WORD1_SPACE_TOTAL
 253 };
 254
 255 const u32 nfs4_pathconf_bitmap[3] = {
 256         FATTR4_WORD0_MAXLINK
 257         | FATTR4_WORD0_MAXNAME,
 258         0
 259 };
 260
 261 const u32 nfs4_fsinfo_bitmap[3] = { FATTR4_WORD0_MAXFILESIZE
 262                         | FATTR4_WORD0_MAXREAD
 263                         | FATTR4_WORD0_MAXWRITE
 264                         | FATTR4_WORD0_LEASE_TIME,
 265                         FATTR4_WORD1_TIME_DELTA
 266                         | FATTR4_WORD1_FS_LAYOUT_TYPES,
 267                         FATTR4_WORD2_LAYOUT_BLKSIZE
 268                         | FATTR4_WORD2_CLONE_BLKSIZE
 269                         | FATTR4_WORD2_CHANGE_ATTR_TYPE
 270                         | FATTR4_WORD2_XATTR_SUPPORT
 271 };
 272
 273 const u32 nfs4_fs_locations_bitmap[3] = {
 274         FATTR4_WORD0_CHANGE
 275         | FATTR4_WORD0_SIZE
 276         | FATTR4_WORD0_FSID
 277         | FATTR4_WORD0_FILEID
 278         | FATTR4_WORD0_FS_LOCATIONS,
 279         FATTR4_WORD1_OWNER
 280         | FATTR4_WORD1_OWNER_GROUP
 281         | FATTR4_WORD1_RAWDEV
 282         | FATTR4_WORD1_SPACE_USED
 283         | FATTR4_WORD1_TIME_ACCESS
 284         | FATTR4_WORD1_TIME_METADATA
 285         | FATTR4_WORD1_TIME_MODIFY
 286         | FATTR4_WORD1_MOUNTED_ON_FILEID,
 287 };
 288
 289 static void nfs4_bitmap_copy_adjust(__u32 *dst, const __u32 *src,
 290                                     struct inode *inode, unsigned long flags)
 291 {
 292         unsigned long cache_validity;
 293
 294         memcpy(dst, src, NFS4_BITMASK_SZ*sizeof(*dst));
 295         if (!inode || !nfs4_have_delegation(inode, FMODE_READ))
 296                 return;
 297
 298         cache_validity = READ_ONCE(NFS_I(inode)->cache_validity) | flags;
 299
 300         /* Remove the attributes over which we have full control */
 301         dst[1] &= ~FATTR4_WORD1_RAWDEV;
 302         if (!(cache_validity & NFS_INO_INVALID_SIZE))
 303                 dst[0] &= ~FATTR4_WORD0_SIZE;
 304
 305         if (!(cache_validity & NFS_INO_INVALID_CHANGE))
 306                 dst[0] &= ~FATTR4_WORD0_CHANGE;
 307
 308         if (!(cache_validity & NFS_INO_INVALID_MODE))
 309                 dst[1] &= ~FATTR4_WORD1_MODE;
 310         if (!(cache_validity & NFS_INO_INVALID_OTHER))
 311                 dst[1] &= ~(FATTR4_WORD1_OWNER | FATTR4_WORD1_OWNER_GROUP);
 312 }
 313
 314 static void nfs4_setup_readdir(u64 cookie, __be32 *verifier, struct dentry *dentry,
 315                 struct nfs4_readdir_arg *readdir)
 316 {
 317         unsigned int attrs = FATTR4_WORD0_FILEID | FATTR4_WORD0_TYPE;
 318         __be32 *start, *p;
 319
 320         if (cookie > 2) {
 321                 readdir->cookie = cookie;
 322                 memcpy(&readdir->verifier, verifier, sizeof(readdir->verifier));
 323                 return;
 324         }
 325
 326         readdir->cookie = 0;
 327         memset(&readdir->verifier, 0, sizeof(readdir->verifier));
 328         if (cookie == 2)
 329                 return;
 330
 331         /*
 332          * NFSv4 servers do not return entries for '.' and '..'
 333          * Therefore, we fake these entries here.  We let '.'
 334          * have cookie 0 and '..' have cookie 1.  Note that
 335          * when talking to the server, we always send cookie 0
 336          * instead of 1 or 2.
 337          */
 338         start = p = kmap_atomic(*readdir->pages);
 339
 340         if (cookie == 0) {
 341                 *p++ = xdr_one;                                  /* next */
 342                 *p++ = xdr_zero;                   /* cookie, first word */
 343                 *p++ = xdr_one;                   /* cookie, second word */
 344                 *p++ = xdr_one;                             /* entry len */
 345                 memcpy(p, ".\0\0\0", 4);                        /* entry */
 346                 p++;
 347                 *p++ = xdr_one;                         /* bitmap length */
 348                 *p++ = htonl(attrs);                           /* bitmap */
 349                 *p++ = htonl(12);             /* attribute buffer length */
 350                 *p++ = htonl(NF4DIR);
 351                 p = xdr_encode_hyper(p, NFS_FILEID(d_inode(dentry)));
 352         }
 353
 354         *p++ = xdr_one;                                  /* next */
 355         *p++ = xdr_zero;                   /* cookie, first word */
 356         *p++ = xdr_two;                   /* cookie, second word */
 357         *p++ = xdr_two;                             /* entry len */
 358         memcpy(p, "..\0\0", 4);                         /* entry */
 359         p++;
 360         *p++ = xdr_one;                         /* bitmap length */
 361         *p++ = htonl(attrs);                           /* bitmap */
 362         *p++ = htonl(12);             /* attribute buffer length */
 363         *p++ = htonl(NF4DIR);
 364         p = xdr_encode_hyper(p, NFS_FILEID(d_inode(dentry->d_parent)));
 365
 366         readdir->pgbase = (char *)p - (char *)start;
 367         readdir->count -= readdir->pgbase;
 368         kunmap_atomic(start);
 369 }
 370
 371 static void nfs4_fattr_set_prechange(struct nfs_fattr *fattr, u64 version)
 372 {
 373         if (!(fattr->valid & NFS_ATTR_FATTR_PRECHANGE)) {
 374                 fattr->pre_change_attr = version;
 375                 fattr->valid |= NFS_ATTR_FATTR_PRECHANGE;
 376         }
 377 }
 378
 379 static void nfs4_test_and_free_stateid(struct nfs_server *server,
 380                 nfs4_stateid *stateid,
 381                 const struct cred *cred)
 382 {
 383         const struct nfs4_minor_version_ops *ops = server->nfs_client->cl_mvops;
 384
 385         ops->test_and_free_expired(server, stateid, cred);
 386 }
 387
 388 static void __nfs4_free_revoked_stateid(struct nfs_server *server,
 389                 nfs4_stateid *stateid,
 390                 const struct cred *cred)
 391 {
 392         stateid->type = NFS4_REVOKED_STATEID_TYPE;
 393         nfs4_test_and_free_stateid(server, stateid, cred);
 394 }
 395
 396 static void nfs4_free_revoked_stateid(struct nfs_server *server,
 397                 const nfs4_stateid *stateid,
 398                 const struct cred *cred)
 399 {
 400         nfs4_stateid tmp;
 401
 402         nfs4_stateid_copy(&tmp, stateid);
 403         __nfs4_free_revoked_stateid(server, &tmp, cred);
 404 }
 405
 406 static long nfs4_update_delay(long *timeout)
 407 {
 408         long ret;
 409         if (!timeout)
 410                 return NFS4_POLL_RETRY_MAX;
 411         if (*timeout <= 0)
 412                 *timeout = NFS4_POLL_RETRY_MIN;
 413         if (*timeout > NFS4_POLL_RETRY_MAX)
 414                 *timeout = NFS4_POLL_RETRY_MAX;
 415         ret = *timeout;
 416         *timeout <<= 1;
 417         return ret;
 418 }
 419
 420 static int nfs4_delay_killable(long *timeout)
 421 {
 422         might_sleep();
 423
 424         __set_current_state(TASK_KILLABLE|TASK_FREEZABLE_UNSAFE);
 425         schedule_timeout(nfs4_update_delay(timeout));
 426         if (!__fatal_signal_pending(current))
 427                 return 0;
 428         return -EINTR;
 429 }
 430
 431 static int nfs4_delay_interruptible(long *timeout)
 432 {
 433         might_sleep();
 434
 435         __set_current_state(TASK_INTERRUPTIBLE|TASK_FREEZABLE_UNSAFE);
 436         schedule_timeout(nfs4_update_delay(timeout));
 437         if (!signal_pending(current))
 438                 return 0;
 439         return __fatal_signal_pending(current) ? -EINTR :-ERESTARTSYS;
 440 }
 441
 442 static int nfs4_delay(long *timeout, bool interruptible)
 443 {
 444         if (interruptible)
 445                 return nfs4_delay_interruptible(timeout);
 446         return nfs4_delay_killable(timeout);
 447 }
 448
 449 static const nfs4_stateid *
 450 nfs4_recoverable_stateid(const nfs4_stateid *stateid)
 451 {
 452         if (!stateid)
 453                 return NULL;
 454         switch (stateid->type) {
 455         case NFS4_OPEN_STATEID_TYPE:
 456         case NFS4_LOCK_STATEID_TYPE:
 457         case NFS4_DELEGATION_STATEID_TYPE:
 458                 return stateid;
 459         default:
 460                 break;
 461         }
 462         return NULL;
 463 }
 464
 465 /* This is the error handling routine for processes that are allowed
 466  * to sleep.
 467  */
 468 static int nfs4_do_handle_exception(struct nfs_server *server,
 469                 int errorcode, struct nfs4_exception *exception)
 470 {
 471         struct nfs_client *clp = server->nfs_client;
 472         struct nfs4_state *state = exception->state;
 473         const nfs4_stateid *stateid;
 474         struct inode *inode = exception->inode;
 475         int ret = errorcode;
 476
 477         exception->delay = 0;
 478         exception->recovering = 0;
 479         exception->retry = 0;
 480
 481         stateid = nfs4_recoverable_stateid(exception->stateid);
 482         if (stateid == NULL && state != NULL)
 483                 stateid = nfs4_recoverable_stateid(&state->stateid);
 484
 485         switch(errorcode) {
 486                 case 0:
 487                         return 0;
 488                 case -NFS4ERR_BADHANDLE:
 489                 case -ESTALE:
 490                         if (inode != NULL && S_ISREG(inode->i_mode))
 491                                 pnfs_destroy_layout(NFS_I(inode));
 492                         break;
 493                 case -NFS4ERR_DELEG_REVOKED:
 494                 case -NFS4ERR_ADMIN_REVOKED:
 495                 case -NFS4ERR_EXPIRED:
 496                 case -NFS4ERR_BAD_STATEID:
 497                 case -NFS4ERR_PARTNER_NO_AUTH:
 498                         if (inode != NULL && stateid != NULL) {
 499                                 nfs_inode_find_state_and_recover(inode,
 500                                                 stateid);
 501                                 goto wait_on_recovery;
 502                         }
 503                         fallthrough;
 504                 case -NFS4ERR_OPENMODE:
 505                         if (inode) {
 506                                 int err;
 507
 508                                 err = nfs_async_inode_return_delegation(inode,
 509                                                 stateid);
 510                                 if (err == 0)
 511                                         goto wait_on_recovery;
 512                                 if (stateid != NULL && stateid->type == NFS4_DELEGATION_STATEID_TYPE) {
 513                                         exception->retry = 1;
 514                                         break;
 515                                 }
 516                         }
 517                         if (state == NULL)
 518                                 break;
 519                         ret = nfs4_schedule_stateid_recovery(server, state);
 520                         if (ret < 0)
 521                                 break;
 522                         goto wait_on_recovery;
 523                 case -NFS4ERR_STALE_STATEID:
 524                 case -NFS4ERR_STALE_CLIENTID:
 525                         nfs4_schedule_lease_recovery(clp);
 526                         goto wait_on_recovery;
 527                 case -NFS4ERR_MOVED:
 528                         ret = nfs4_schedule_migration_recovery(server);
 529                         if (ret < 0)
 530                                 break;
 531                         goto wait_on_recovery;
 532                 case -NFS4ERR_LEASE_MOVED:
 533                         nfs4_schedule_lease_moved_recovery(clp);
 534                         goto wait_on_recovery;
 535 #if defined(CONFIG_NFS_V4_1)
 536                 case -NFS4ERR_BADSESSION:
 537                 case -NFS4ERR_BADSLOT:
 538                 case -NFS4ERR_BAD_HIGH_SLOT:
 539                 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
 540                 case -NFS4ERR_DEADSESSION:
 541                 case -NFS4ERR_SEQ_FALSE_RETRY:
 542                 case -NFS4ERR_SEQ_MISORDERED:
 543                         /* Handled in nfs41_sequence_process() */
 544                         goto wait_on_recovery;
 545 #endif /* defined(CONFIG_NFS_V4_1) */
 546                 case -NFS4ERR_FILE_OPEN:
 547                         if (exception->timeout > HZ) {
 548                                 /* We have retried a decent amount, time to
 549                                  * fail
 550                                  */
 551                                 ret = -EBUSY;
 552                                 break;
 553                         }
 554                         fallthrough;
 555                 case -NFS4ERR_DELAY:
 556                         nfs_inc_server_stats(server, NFSIOS_DELAY);
 557                         fallthrough;
 558                 case -NFS4ERR_GRACE:
 559                 case -NFS4ERR_LAYOUTTRYLATER:
 560                 case -NFS4ERR_RECALLCONFLICT:
 561                         exception->delay = 1;
 562                         return 0;
 563
 564                 case -NFS4ERR_RETRY_UNCACHED_REP:
 565                 case -NFS4ERR_OLD_STATEID:
 566                         exception->retry = 1;
 567                         break;
 568                 case -NFS4ERR_BADOWNER:
 569                         /* The following works around a Linux server bug! */
 570                 case -NFS4ERR_BADNAME:
 571                         if (server->caps & NFS_CAP_UIDGID_NOMAP) {
 572                                 server->caps &= ~NFS_CAP_UIDGID_NOMAP;
 573                                 exception->retry = 1;
 574                                 printk(KERN_WARNING "NFS: v4 server %s "
 575                                                 "does not accept raw "
 576                                                 "uid/gids. "
 577                                                 "Reenabling the idmapper.\n",
 578                                                 server->nfs_client->cl_hostname);
 579                         }
 580         }
 581         /* We failed to handle the error */
 582         return nfs4_map_errors(ret);
 583 wait_on_recovery:
 584         exception->recovering = 1;
 585         return 0;
 586 }
 587
 588 /* This is the error handling routine for processes that are allowed
 589  * to sleep.
 590  */
 591 int nfs4_handle_exception(struct nfs_server *server, int errorcode, struct nfs4_exception *exception)
 592 {
 593         struct nfs_client *clp = server->nfs_client;
 594         int ret;
 595
 596         ret = nfs4_do_handle_exception(server, errorcode, exception);
 597         if (exception->delay) {
 598                 ret = nfs4_delay(&exception->timeout,
 599                                 exception->interruptible);
 600                 goto out_retry;
 601         }
 602         if (exception->recovering) {
 603                 if (exception->task_is_privileged)
 604                         return -EDEADLOCK;
 605                 ret = nfs4_wait_clnt_recover(clp);
 606                 if (test_bit(NFS_MIG_FAILED, &server->mig_status))
 607                         return -EIO;
 608                 goto out_retry;
 609         }
 610         return ret;
 611 out_retry:
 612         if (ret == 0)
 613                 exception->retry = 1;
 614         return ret;
 615 }
 616
 617 static int
 618 nfs4_async_handle_exception(struct rpc_task *task, struct nfs_server *server,
 619                 int errorcode, struct nfs4_exception *exception)
 620 {
 621         struct nfs_client *clp = server->nfs_client;
 622         int ret;
 623
 624         ret = nfs4_do_handle_exception(server, errorcode, exception);
 625         if (exception->delay) {
 626                 rpc_delay(task, nfs4_update_delay(&exception->timeout));
 627                 goto out_retry;
 628         }
 629         if (exception->recovering) {
 630                 if (exception->task_is_privileged)
 631                         return -EDEADLOCK;
 632                 rpc_sleep_on(&clp->cl_rpcwaitq, task, NULL);
 633                 if (test_bit(NFS4CLNT_MANAGER_RUNNING, &clp->cl_state) == 0)
 634                         rpc_wake_up_queued_task(&clp->cl_rpcwaitq, task);
 635                 goto out_retry;
 636         }
 637         if (test_bit(NFS_MIG_FAILED, &server->mig_status))
 638                 ret = -EIO;
 639         return ret;
 640 out_retry:
 641         if (ret == 0) {
 642                 exception->retry = 1;
 643                 /*
 644                  * For NFS4ERR_MOVED, the client transport will need to
 645                  * be recomputed after migration recovery has completed.
 646                  */
 647                 if (errorcode == -NFS4ERR_MOVED)
 648                         rpc_task_release_transport(task);
 649         }
 650         return ret;
 651 }
 652
 653 int
 654 nfs4_async_handle_error(struct rpc_task *task, struct nfs_server *server,
 655                         struct nfs4_state *state, long *timeout)
 656 {
 657         struct nfs4_exception exception = {
 658                 .state = state,
 659         };
 660
 661         if (task->tk_status >= 0)
 662                 return 0;
 663         if (timeout)
 664                 exception.timeout = *timeout;
 665         task->tk_status = nfs4_async_handle_exception(task, server,
 666                         task->tk_status,
 667                         &exception);
 668         if (exception.delay && timeout)
 669                 *timeout = exception.timeout;
 670         if (exception.retry)
 671                 return -EAGAIN;
 672         return 0;
 673 }
 674
 675 /*
 676  * Return 'true' if 'clp' is using an rpc_client that is integrity protected
 677  * or 'false' otherwise.
 678  */
 679 static bool _nfs4_is_integrity_protected(struct nfs_client *clp)
 680 {
 681         rpc_authflavor_t flavor = clp->cl_rpcclient->cl_auth->au_flavor;
 682         return (flavor == RPC_AUTH_GSS_KRB5I) || (flavor == RPC_AUTH_GSS_KRB5P);
 683 }
 684
 685 static void do_renew_lease(struct nfs_client *clp, unsigned long timestamp)
 686 {
 687         spin_lock(&clp->cl_lock);
 688         if (time_before(clp->cl_last_renewal,timestamp))
 689                 clp->cl_last_renewal = timestamp;
 690         spin_unlock(&clp->cl_lock);
 691 }
 692
 693 static void renew_lease(const struct nfs_server *server, unsigned long timestamp)
 694 {
 695         struct nfs_client *clp = server->nfs_client;
 696
 697         if (!nfs4_has_session(clp))
 698                 do_renew_lease(clp, timestamp);
 699 }
 700
 701 struct nfs4_call_sync_data {
 702         const struct nfs_server *seq_server;
 703         struct nfs4_sequence_args *seq_args;
 704         struct nfs4_sequence_res *seq_res;
 705 };
 706
 707 void nfs4_init_sequence(struct nfs4_sequence_args *args,
 708                         struct nfs4_sequence_res *res, int cache_reply,
 709                         int privileged)
 710 {
 711         args->sa_slot = NULL;
 712         args->sa_cache_this = cache_reply;
 713         args->sa_privileged = privileged;
 714
 715         res->sr_slot = NULL;
 716 }
 717
 718 static void nfs40_sequence_free_slot(struct nfs4_sequence_res *res)
 719 {
 720         struct nfs4_slot *slot = res->sr_slot;
 721         struct nfs4_slot_table *tbl;
 722
 723         tbl = slot->table;
 724         spin_lock(&tbl->slot_tbl_lock);
 725         if (!nfs41_wake_and_assign_slot(tbl, slot))
 726                 nfs4_free_slot(tbl, slot);
 727         spin_unlock(&tbl->slot_tbl_lock);
 728
 729         res->sr_slot = NULL;
 730 }
 731
 732 static int nfs40_sequence_done(struct rpc_task *task,
 733                                struct nfs4_sequence_res *res)
 734 {
 735         if (res->sr_slot != NULL)
 736                 nfs40_sequence_free_slot(res);
 737         return 1;
 738 }
 739
 740 #if defined(CONFIG_NFS_V4_1)
 741
 742 static void nfs41_release_slot(struct nfs4_slot *slot)
 743 {
 744         struct nfs4_session *session;
 745         struct nfs4_slot_table *tbl;
 746         bool send_new_highest_used_slotid = false;
 747
 748         if (!slot)
 749                 return;
 750         tbl = slot->table;
 751         session = tbl->session;
 752
 753         /* Bump the slot sequence number */
 754         if (slot->seq_done)
 755                 slot->seq_nr++;
 756         slot->seq_done = 0;
 757
 758         spin_lock(&tbl->slot_tbl_lock);
 759         /* Be nice to the server: try to ensure that the last transmitted
 760          * value for highest_user_slotid <= target_highest_slotid
 761          */
 762         if (tbl->highest_used_slotid > tbl->target_highest_slotid)
 763                 send_new_highest_used_slotid = true;
 764
 765         if (nfs41_wake_and_assign_slot(tbl, slot)) {
 766                 send_new_highest_used_slotid = false;
 767                 goto out_unlock;
 768         }
 769         nfs4_free_slot(tbl, slot);
 770
 771         if (tbl->highest_used_slotid != NFS4_NO_SLOT)
 772                 send_new_highest_used_slotid = false;
 773 out_unlock:
 774         spin_unlock(&tbl->slot_tbl_lock);
 775         if (send_new_highest_used_slotid)
 776                 nfs41_notify_server(session->clp);
 777         if (waitqueue_active(&tbl->slot_waitq))
 778                 wake_up_all(&tbl->slot_waitq);
 779 }
 780
 781 static void nfs41_sequence_free_slot(struct nfs4_sequence_res *res)
 782 {
 783         nfs41_release_slot(res->sr_slot);
 784         res->sr_slot = NULL;
 785 }
 786
 787 static void nfs4_slot_sequence_record_sent(struct nfs4_slot *slot,
 788                 u32 seqnr)
 789 {
 790         if ((s32)(seqnr - slot->seq_nr_highest_sent) > 0)
 791                 slot->seq_nr_highest_sent = seqnr;
 792 }
 793 static void nfs4_slot_sequence_acked(struct nfs4_slot *slot, u32 seqnr)
 794 {
 795         nfs4_slot_sequence_record_sent(slot, seqnr);
 796         slot->seq_nr_last_acked = seqnr;
 797 }
 798
 799 static void nfs4_probe_sequence(struct nfs_client *client, const struct cred *cred,
 800                                 struct nfs4_slot *slot)
 801 {
 802         struct rpc_task *task = _nfs41_proc_sequence(client, cred, slot, true);
 803         if (!IS_ERR(task))
 804                 rpc_put_task_async(task);
 805 }
 806
 807 static int nfs41_sequence_process(struct rpc_task *task,
 808                 struct nfs4_sequence_res *res)
 809 {
 810         struct nfs4_session *session;
 811         struct nfs4_slot *slot = res->sr_slot;
 812         struct nfs_client *clp;
 813         int status;
 814         int ret = 1;
 815
 816         if (slot == NULL)
 817                 goto out_noaction;
 818         /* don't increment the sequence number if the task wasn't sent */
 819         if (!RPC_WAS_SENT(task) || slot->seq_done)
 820                 goto out;
 821
 822         session = slot->table->session;
 823         clp = session->clp;
 824
 825         trace_nfs4_sequence_done(session, res);
 826
 827         status = res->sr_status;
 828         if (task->tk_status == -NFS4ERR_DEADSESSION)
 829                 status = -NFS4ERR_DEADSESSION;
 830
 831         /* Check the SEQUENCE operation status */
 832         switch (status) {
 833         case 0:
 834                 /* Mark this sequence number as having been acked */
 835                 nfs4_slot_sequence_acked(slot, slot->seq_nr);
 836                 /* Update the slot's sequence and clientid lease timer */
 837                 slot->seq_done = 1;
 838                 do_renew_lease(clp, res->sr_timestamp);
 839                 /* Check sequence flags */
 840                 nfs41_handle_sequence_flag_errors(clp, res->sr_status_flags,
 841                                 !!slot->privileged);
 842                 nfs41_update_target_slotid(slot->table, slot, res);
 843                 break;
 844         case 1:
 845                 /*
 846                  * sr_status remains 1 if an RPC level error occurred.
 847                  * The server may or may not have processed the sequence
 848                  * operation..
 849                  */
 850                 nfs4_slot_sequence_record_sent(slot, slot->seq_nr);
 851                 slot->seq_done = 1;
 852                 goto out;
 853         case -NFS4ERR_DELAY:
 854                 /* The server detected a resend of the RPC call and
 855                  * returned NFS4ERR_DELAY as per Section 2.10.6.2
 856                  * of RFC5661.
 857                  */
 858                 dprintk("%s: slot=%u seq=%u: Operation in progress\n",
 859                         __func__,
 860                         slot->slot_nr,
 861                         slot->seq_nr);
 862                 goto out_retry;
 863         case -NFS4ERR_RETRY_UNCACHED_REP:
 864         case -NFS4ERR_SEQ_FALSE_RETRY:
 865                 /*
 866                  * The server thinks we tried to replay a request.
 867                  * Retry the call after bumping the sequence ID.
 868                  */
 869                 nfs4_slot_sequence_acked(slot, slot->seq_nr);
 870                 goto retry_new_seq;
 871         case -NFS4ERR_BADSLOT:
 872                 /*
 873                  * The slot id we used was probably retired. Try again
 874                  * using a different slot id.
 875                  */
 876                 if (slot->slot_nr < slot->table->target_highest_slotid)
 877                         goto session_recover;
 878                 goto retry_nowait;
 879         case -NFS4ERR_SEQ_MISORDERED:
 880                 nfs4_slot_sequence_record_sent(slot, slot->seq_nr);
 881                 /*
 882                  * Were one or more calls using this slot interrupted?
 883                  * If the server never received the request, then our
 884                  * transmitted slot sequence number may be too high. However,
 885                  * if the server did receive the request then it might
 886                  * accidentally give us a reply with a mismatched operation.
 887                  * We can sort this out by sending a lone sequence operation
 888                  * to the server on the same slot.
 889                  */
 890                 if ((s32)(slot->seq_nr - slot->seq_nr_last_acked) > 1) {
 891                         slot->seq_nr--;
 892                         if (task->tk_msg.rpc_proc != &nfs4_procedures[NFSPROC4_CLNT_SEQUENCE]) {
 893                                 nfs4_probe_sequence(clp, task->tk_msg.rpc_cred, slot);
 894                                 res->sr_slot = NULL;
 895                         }
 896                         goto retry_nowait;
 897                 }
 898                 /*
 899                  * RFC5661:
 900                  * A retry might be sent while the original request is
 901                  * still in progress on the replier. The replier SHOULD
 902                  * deal with the issue by returning NFS4ERR_DELAY as the
 903                  * reply to SEQUENCE or CB_SEQUENCE operation, but
 904                  * implementations MAY return NFS4ERR_SEQ_MISORDERED.
 905                  *
 906                  * Restart the search after a delay.
 907                  */
 908                 slot->seq_nr = slot->seq_nr_highest_sent;
 909                 goto out_retry;
 910         case -NFS4ERR_BADSESSION:
 911         case -NFS4ERR_DEADSESSION:
 912         case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
 913                 goto session_recover;
 914         default:
 915                 /* Just update the slot sequence no. */
 916                 slot->seq_done = 1;
 917         }
 918 out:
 919         /* The session may be reset by one of the error handlers. */
 920         dprintk("%s: Error %d free the slot \n", __func__, res->sr_status);
 921 out_noaction:
 922         return ret;
 923 session_recover:
 924         nfs4_schedule_session_recovery(session, status);
 925         dprintk("%s ERROR: %d Reset session\n", __func__, status);
 926         nfs41_sequence_free_slot(res);
 927         goto out;
 928 retry_new_seq:
 929         ++slot->seq_nr;
 930 retry_nowait:
 931         if (rpc_restart_call_prepare(task)) {
 932                 nfs41_sequence_free_slot(res);
 933                 task->tk_status = 0;
 934                 ret = 0;
 935         }
 936         goto out;
 937 out_retry:
 938         if (!rpc_restart_call(task))
 939                 goto out;
 940         rpc_delay(task, NFS4_POLL_RETRY_MAX);
 941         return 0;
 942 }
 943
 944 int nfs41_sequence_done(struct rpc_task *task, struct nfs4_sequence_res *res)
 945 {
 946         if (!nfs41_sequence_process(task, res))
 947                 return 0;
 948         if (res->sr_slot != NULL)
 949                 nfs41_sequence_free_slot(res);
 950         return 1;
 951
 952 }
 953 EXPORT_SYMBOL_GPL(nfs41_sequence_done);
 954
 955 static int nfs4_sequence_process(struct rpc_task *task, struct nfs4_sequence_res *res)
 956 {
 957         if (res->sr_slot == NULL)
 958                 return 1;
 959         if (res->sr_slot->table->session != NULL)
 960                 return nfs41_sequence_process(task, res);
 961         return nfs40_sequence_done(task, res);
 962 }
 963
 964 static void nfs4_sequence_free_slot(struct nfs4_sequence_res *res)
 965 {
 966         if (res->sr_slot != NULL) {
 967                 if (res->sr_slot->table->session != NULL)
 968                         nfs41_sequence_free_slot(res);
 969                 else
 970                         nfs40_sequence_free_slot(res);
 971         }
 972 }
 973
 974 int nfs4_sequence_done(struct rpc_task *task, struct nfs4_sequence_res *res)
 975 {
 976         if (res->sr_slot == NULL)
 977                 return 1;
 978         if (!res->sr_slot->table->session)
 979                 return nfs40_sequence_done(task, res);
 980         return nfs41_sequence_done(task, res);
 981 }
 982 EXPORT_SYMBOL_GPL(nfs4_sequence_done);
 983
 984 static void nfs41_call_sync_prepare(struct rpc_task *task, void *calldata)
 985 {
 986         struct nfs4_call_sync_data *data = calldata;
 987
 988         dprintk("--> %s data->seq_server %p\n", __func__, data->seq_server);
 989
 990         nfs4_setup_sequence(data->seq_server->nfs_client,
 991                             data->seq_args, data->seq_res, task);
 992 }
 993
 994 static void nfs41_call_sync_done(struct rpc_task *task, void *calldata)
 995 {
 996         struct nfs4_call_sync_data *data = calldata;
 997
 998         nfs41_sequence_done(task, data->seq_res);
 999 }
1000
1001 static const struct rpc_call_ops nfs41_call_sync_ops = {
1002         .rpc_call_prepare = nfs41_call_sync_prepare,
1003         .rpc_call_done = nfs41_call_sync_done,
1004 };
1005
1006 #else   /* !CONFIG_NFS_V4_1 */
1007
1008 static int nfs4_sequence_process(struct rpc_task *task, struct nfs4_sequence_res *res)
1009 {
1010         return nfs40_sequence_done(task, res);
1011 }
1012
1013 static void nfs4_sequence_free_slot(struct nfs4_sequence_res *res)
1014 {
1015         if (res->sr_slot != NULL)
1016                 nfs40_sequence_free_slot(res);
1017 }
1018
1019 int nfs4_sequence_done(struct rpc_task *task,
1020                        struct nfs4_sequence_res *res)
1021 {
1022         return nfs40_sequence_done(task, res);
1023 }
1024 EXPORT_SYMBOL_GPL(nfs4_sequence_done);
1025
1026 #endif  /* !CONFIG_NFS_V4_1 */
1027
1028 static void nfs41_sequence_res_init(struct nfs4_sequence_res *res)
1029 {
1030         res->sr_timestamp = jiffies;
1031         res->sr_status_flags = 0;
1032         res->sr_status = 1;
1033 }
1034
1035 static
1036 void nfs4_sequence_attach_slot(struct nfs4_sequence_args *args,
1037                 struct nfs4_sequence_res *res,
1038                 struct nfs4_slot *slot)
1039 {
1040         if (!slot)
1041                 return;
1042         slot->privileged = args->sa_privileged ? 1 : 0;
1043         args->sa_slot = slot;
1044
1045         res->sr_slot = slot;
1046 }
1047
1048 int nfs4_setup_sequence(struct nfs_client *client,
1049                         struct nfs4_sequence_args *args,
1050                         struct nfs4_sequence_res *res,
1051                         struct rpc_task *task)
1052 {
1053         struct nfs4_session *session = nfs4_get_session(client);
1054         struct nfs4_slot_table *tbl  = client->cl_slot_tbl;
1055         struct nfs4_slot *slot;
1056
1057         /* slot already allocated? */
1058         if (res->sr_slot != NULL)
1059                 goto out_start;
1060
1061         if (session)
1062                 tbl = &session->fc_slot_table;
1063
1064         spin_lock(&tbl->slot_tbl_lock);
1065         /* The state manager will wait until the slot table is empty */
1066         if (nfs4_slot_tbl_draining(tbl) && !args->sa_privileged)
1067                 goto out_sleep;
1068
1069         slot = nfs4_alloc_slot(tbl);
1070         if (IS_ERR(slot)) {
1071                 if (slot == ERR_PTR(-ENOMEM))
1072                         goto out_sleep_timeout;
1073                 goto out_sleep;
1074         }
1075         spin_unlock(&tbl->slot_tbl_lock);
1076
1077         nfs4_sequence_attach_slot(args, res, slot);
1078
1079         trace_nfs4_setup_sequence(session, args);
1080 out_start:
1081         nfs41_sequence_res_init(res);
1082         rpc_call_start(task);
1083         return 0;
1084 out_sleep_timeout:
1085         /* Try again in 1/4 second */
1086         if (args->sa_privileged)
1087                 rpc_sleep_on_priority_timeout(&tbl->slot_tbl_waitq, task,
1088                                 jiffies + (HZ >> 2), RPC_PRIORITY_PRIVILEGED);
1089         else
1090                 rpc_sleep_on_timeout(&tbl->slot_tbl_waitq, task,
1091                                 NULL, jiffies + (HZ >> 2));
1092         spin_unlock(&tbl->slot_tbl_lock);
1093         return -EAGAIN;
1094 out_sleep:
1095         if (args->sa_privileged)
1096                 rpc_sleep_on_priority(&tbl->slot_tbl_waitq, task,
1097                                 RPC_PRIORITY_PRIVILEGED);
1098         else
1099                 rpc_sleep_on(&tbl->slot_tbl_waitq, task, NULL);
1100         spin_unlock(&tbl->slot_tbl_lock);
1101         return -EAGAIN;
1102 }
1103 EXPORT_SYMBOL_GPL(nfs4_setup_sequence);
1104
1105 static void nfs40_call_sync_prepare(struct rpc_task *task, void *calldata)
1106 {
1107         struct nfs4_call_sync_data *data = calldata;
1108         nfs4_setup_sequence(data->seq_server->nfs_client,
1109                                 data->seq_args, data->seq_res, task);
1110 }
1111
1112 static void nfs40_call_sync_done(struct rpc_task *task, void *calldata)
1113 {
1114         struct nfs4_call_sync_data *data = calldata;
1115         nfs4_sequence_done(task, data->seq_res);
1116 }
1117
1118 static const struct rpc_call_ops nfs40_call_sync_ops = {
1119         .rpc_call_prepare = nfs40_call_sync_prepare,
1120         .rpc_call_done = nfs40_call_sync_done,
1121 };
1122
1123 static int nfs4_call_sync_custom(struct rpc_task_setup *task_setup)
1124 {
1125         int ret;
1126         struct rpc_task *task;
1127
1128         task = rpc_run_task(task_setup);
1129         if (IS_ERR(task))
1130                 return PTR_ERR(task);
1131
1132         ret = task->tk_status;
1133         rpc_put_task(task);
1134         return ret;
1135 }
1136
1137 static int nfs4_do_call_sync(struct rpc_clnt *clnt,
1138                              struct nfs_server *server,
1139                              struct rpc_message *msg,
1140                              struct nfs4_sequence_args *args,
1141                              struct nfs4_sequence_res *res,
1142                              unsigned short task_flags)
1143 {
1144         struct nfs_client *clp = server->nfs_client;
1145         struct nfs4_call_sync_data data = {
1146                 .seq_server = server,
1147                 .seq_args = args,
1148                 .seq_res = res,
1149         };
1150         struct rpc_task_setup task_setup = {
1151                 .rpc_client = clnt,
1152                 .rpc_message = msg,
1153                 .callback_ops = clp->cl_mvops->call_sync_ops,
1154                 .callback_data = &data,
1155                 .flags = task_flags,
1156         };
1157
1158         return nfs4_call_sync_custom(&task_setup);
1159 }
1160
1161 static int nfs4_call_sync_sequence(struct rpc_clnt *clnt,
1162                                    struct nfs_server *server,
1163                                    struct rpc_message *msg,
1164                                    struct nfs4_sequence_args *args,
1165                                    struct nfs4_sequence_res *res)
1166 {
1167         unsigned short task_flags = 0;
1168
1169         if (server->caps & NFS_CAP_MOVEABLE)
1170                 task_flags = RPC_TASK_MOVEABLE;
1171         return nfs4_do_call_sync(clnt, server, msg, args, res, task_flags);
1172 }
1173
1174
1175 int nfs4_call_sync(struct rpc_clnt *clnt,
1176                    struct nfs_server *server,
1177                    struct rpc_message *msg,
1178                    struct nfs4_sequence_args *args,
1179                    struct nfs4_sequence_res *res,
1180                    int cache_reply)
1181 {
1182         nfs4_init_sequence(args, res, cache_reply, 0);
1183         return nfs4_call_sync_sequence(clnt, server, msg, args, res);
1184 }
1185
1186 static void
1187 nfs4_inc_nlink_locked(struct inode *inode)
1188 {
1189         nfs_set_cache_invalid(inode, NFS_INO_INVALID_CHANGE |
1190                                              NFS_INO_INVALID_CTIME |
1191                                              NFS_INO_INVALID_NLINK);
1192         inc_nlink(inode);
1193 }
1194
1195 static void
1196 nfs4_inc_nlink(struct inode *inode)
1197 {
1198         spin_lock(&inode->i_lock);
1199         nfs4_inc_nlink_locked(inode);
1200         spin_unlock(&inode->i_lock);
1201 }
1202
1203 static void
1204 nfs4_dec_nlink_locked(struct inode *inode)
1205 {
1206         nfs_set_cache_invalid(inode, NFS_INO_INVALID_CHANGE |
1207                                              NFS_INO_INVALID_CTIME |
1208                                              NFS_INO_INVALID_NLINK);
1209         drop_nlink(inode);
1210 }
1211
1212 static void
1213 nfs4_update_changeattr_locked(struct inode *inode,
1214                 struct nfs4_change_info *cinfo,
1215                 unsigned long timestamp, unsigned long cache_validity)
1216 {
1217         struct nfs_inode *nfsi = NFS_I(inode);
1218         u64 change_attr = inode_peek_iversion_raw(inode);
1219
1220         cache_validity |= NFS_INO_INVALID_CTIME | NFS_INO_INVALID_MTIME;
1221         if (S_ISDIR(inode->i_mode))
1222                 cache_validity |= NFS_INO_INVALID_DATA;
1223
1224         switch (NFS_SERVER(inode)->change_attr_type) {
1225         case NFS4_CHANGE_TYPE_IS_UNDEFINED:
1226                 if (cinfo->after == change_attr)
1227                         goto out;
1228                 break;
1229         default:
1230                 if ((s64)(change_attr - cinfo->after) >= 0)
1231                         goto out;
1232         }
1233
1234         inode_set_iversion_raw(inode, cinfo->after);
1235         if (!cinfo->atomic || cinfo->before != change_attr) {
1236                 if (S_ISDIR(inode->i_mode))
1237                         nfs_force_lookup_revalidate(inode);
1238
1239                 if (!NFS_PROTO(inode)->have_delegation(inode, FMODE_READ))
1240                         cache_validity |=
1241                                 NFS_INO_INVALID_ACCESS | NFS_INO_INVALID_ACL |
1242                                 NFS_INO_INVALID_SIZE | NFS_INO_INVALID_OTHER |
1243                                 NFS_INO_INVALID_BLOCKS | NFS_INO_INVALID_NLINK |
1244                                 NFS_INO_INVALID_MODE | NFS_INO_INVALID_XATTR;
1245                 nfsi->attrtimeo = NFS_MINATTRTIMEO(inode);
1246         }
1247         nfsi->attrtimeo_timestamp = jiffies;
1248         nfsi->read_cache_jiffies = timestamp;
1249         nfsi->attr_gencount = nfs_inc_attr_generation_counter();
1250         nfsi->cache_validity &= ~NFS_INO_INVALID_CHANGE;
1251 out:
1252         nfs_set_cache_invalid(inode, cache_validity);
1253 }
1254
1255 void
1256 nfs4_update_changeattr(struct inode *dir, struct nfs4_change_info *cinfo,
1257                 unsigned long timestamp, unsigned long cache_validity)
1258 {
1259         spin_lock(&dir->i_lock);
1260         nfs4_update_changeattr_locked(dir, cinfo, timestamp, cache_validity);
1261         spin_unlock(&dir->i_lock);
1262 }
1263
1264 struct nfs4_open_createattrs {
1265         struct nfs4_label *label;
1266         struct iattr *sattr;
1267         const __u32 verf[2];
1268 };
1269
1270 static bool nfs4_clear_cap_atomic_open_v1(struct nfs_server *server,
1271                 int err, struct nfs4_exception *exception)
1272 {
1273         if (err != -EINVAL)
1274                 return false;
1275         if (!(server->caps & NFS_CAP_ATOMIC_OPEN_V1))
1276                 return false;
1277         server->caps &= ~NFS_CAP_ATOMIC_OPEN_V1;
1278         exception->retry = 1;
1279         return true;
1280 }
1281
1282 static fmode_t _nfs4_ctx_to_accessmode(const struct nfs_open_context *ctx)
1283 {
1284          return ctx->mode & (FMODE_READ|FMODE_WRITE|FMODE_EXEC);
1285 }
1286
1287 static fmode_t _nfs4_ctx_to_openmode(const struct nfs_open_context *ctx)
1288 {
1289         fmode_t ret = ctx->mode & (FMODE_READ|FMODE_WRITE);
1290
1291         return (ctx->mode & FMODE_EXEC) ? FMODE_READ | ret : ret;
1292 }
1293
1294 static u32
1295 nfs4_map_atomic_open_share(struct nfs_server *server,
1296                 fmode_t fmode, int openflags)
1297 {
1298         u32 res = 0;
1299
1300         switch (fmode & (FMODE_READ | FMODE_WRITE)) {
1301         case FMODE_READ:
1302                 res = NFS4_SHARE_ACCESS_READ;
1303                 break;
1304         case FMODE_WRITE:
1305                 res = NFS4_SHARE_ACCESS_WRITE;
1306                 break;
1307         case FMODE_READ|FMODE_WRITE:
1308                 res = NFS4_SHARE_ACCESS_BOTH;
1309         }
1310         if (!(server->caps & NFS_CAP_ATOMIC_OPEN_V1))
1311                 goto out;
1312         /* Want no delegation if we're using O_DIRECT */
1313         if (openflags & O_DIRECT)
1314                 res |= NFS4_SHARE_WANT_NO_DELEG;
1315 out:
1316         return res;
1317 }
1318
1319 static enum open_claim_type4
1320 nfs4_map_atomic_open_claim(struct nfs_server *server,
1321                 enum open_claim_type4 claim)
1322 {
1323         if (server->caps & NFS_CAP_ATOMIC_OPEN_V1)
1324                 return claim;
1325         switch (claim) {
1326         default:
1327                 return claim;
1328         case NFS4_OPEN_CLAIM_FH:
1329                 return NFS4_OPEN_CLAIM_NULL;
1330         case NFS4_OPEN_CLAIM_DELEG_CUR_FH:
1331                 return NFS4_OPEN_CLAIM_DELEGATE_CUR;
1332         case NFS4_OPEN_CLAIM_DELEG_PREV_FH:
1333                 return NFS4_OPEN_CLAIM_DELEGATE_PREV;
1334         }
1335 }
1336
1337 static void nfs4_init_opendata_res(struct nfs4_opendata *p)
1338 {
1339         p->o_res.f_attr = &p->f_attr;
1340         p->o_res.seqid = p->o_arg.seqid;
1341         p->c_res.seqid = p->c_arg.seqid;
1342         p->o_res.server = p->o_arg.server;
1343         p->o_res.access_request = p->o_arg.access;
1344         nfs_fattr_init(&p->f_attr);
1345         nfs_fattr_init_names(&p->f_attr, &p->owner_name, &p->group_name);
1346 }
1347
1348 static struct nfs4_opendata *nfs4_opendata_alloc(struct dentry *dentry,
1349                 struct nfs4_state_owner *sp, fmode_t fmode, int flags,
1350                 const struct nfs4_open_createattrs *c,
1351                 enum open_claim_type4 claim,
1352                 gfp_t gfp_mask)
1353 {
1354         struct dentry *parent = dget_parent(dentry);
1355         struct inode *dir = d_inode(parent);
1356         struct nfs_server *server = NFS_SERVER(dir);
1357         struct nfs_seqid *(*alloc_seqid)(struct nfs_seqid_counter *, gfp_t);
1358         struct nfs4_label *label = (c != NULL) ? c->label : NULL;
1359         struct nfs4_opendata *p;
1360
1361         p = kzalloc(sizeof(*p), gfp_mask);
1362         if (p == NULL)
1363                 goto err;
1364
1365         p->f_attr.label = nfs4_label_alloc(server, gfp_mask);
1366         if (IS_ERR(p->f_attr.label))
1367                 goto err_free_p;
1368
1369         p->a_label = nfs4_label_alloc(server, gfp_mask);
1370         if (IS_ERR(p->a_label))
1371                 goto err_free_f;
1372
1373         alloc_seqid = server->nfs_client->cl_mvops->alloc_seqid;
1374         p->o_arg.seqid = alloc_seqid(&sp->so_seqid, gfp_mask);
1375         if (IS_ERR(p->o_arg.seqid))
1376                 goto err_free_label;
1377         nfs_sb_active(dentry->d_sb);
1378         p->dentry = dget(dentry);
1379         p->dir = parent;
1380         p->owner = sp;
1381         atomic_inc(&sp->so_count);
1382         p->o_arg.open_flags = flags;
1383         p->o_arg.fmode = fmode & (FMODE_READ|FMODE_WRITE);
1384         p->o_arg.claim = nfs4_map_atomic_open_claim(server, claim);
1385         p->o_arg.share_access = nfs4_map_atomic_open_share(server,
1386                         fmode, flags);
1387         if (flags & O_CREAT) {
1388                 p->o_arg.umask = current_umask();
1389                 p->o_arg.label = nfs4_label_copy(p->a_label, label);
1390                 if (c->sattr != NULL && c->sattr->ia_valid != 0) {
1391                         p->o_arg.u.attrs = &p->attrs;
1392                         memcpy(&p->attrs, c->sattr, sizeof(p->attrs));
1393
1394                         memcpy(p->o_arg.u.verifier.data, c->verf,
1395                                         sizeof(p->o_arg.u.verifier.data));
1396                 }
1397         }
1398         /* ask server to check for all possible rights as results
1399          * are cached */
1400         switch (p->o_arg.claim) {
1401         default:
1402                 break;
1403         case NFS4_OPEN_CLAIM_NULL:
1404         case NFS4_OPEN_CLAIM_FH:
1405                 p->o_arg.access = NFS4_ACCESS_READ | NFS4_ACCESS_MODIFY |
1406                                   NFS4_ACCESS_EXTEND | NFS4_ACCESS_DELETE |
1407                                   NFS4_ACCESS_EXECUTE |
1408                                   nfs_access_xattr_mask(server);
1409         }
1410         p->o_arg.clientid = server->nfs_client->cl_clientid;
1411         p->o_arg.id.create_time = ktime_to_ns(sp->so_seqid.create_time);
1412         p->o_arg.id.uniquifier = sp->so_seqid.owner_id;
1413         p->o_arg.name = &dentry->d_name;
1414         p->o_arg.server = server;
1415         p->o_arg.bitmask = nfs4_bitmask(server, label);
1416         p->o_arg.open_bitmap = &nfs4_fattr_bitmap[0];
1417         switch (p->o_arg.claim) {
1418         case NFS4_OPEN_CLAIM_NULL:
1419         case NFS4_OPEN_CLAIM_DELEGATE_CUR:
1420         case NFS4_OPEN_CLAIM_DELEGATE_PREV:
1421                 p->o_arg.fh = NFS_FH(dir);
1422                 break;
1423         case NFS4_OPEN_CLAIM_PREVIOUS:
1424         case NFS4_OPEN_CLAIM_FH:
1425         case NFS4_OPEN_CLAIM_DELEG_CUR_FH:
1426         case NFS4_OPEN_CLAIM_DELEG_PREV_FH:
1427                 p->o_arg.fh = NFS_FH(d_inode(dentry));
1428         }
1429         p->c_arg.fh = &p->o_res.fh;
1430         p->c_arg.stateid = &p->o_res.stateid;
1431         p->c_arg.seqid = p->o_arg.seqid;
1432         nfs4_init_opendata_res(p);
1433         kref_init(&p->kref);
1434         return p;
1435
1436 err_free_label:
1437         nfs4_label_free(p->a_label);
1438 err_free_f:
1439         nfs4_label_free(p->f_attr.label);
1440 err_free_p:
1441         kfree(p);
1442 err:
1443         dput(parent);
1444         return NULL;
1445 }
1446
1447 static void nfs4_opendata_free(struct kref *kref)
1448 {
1449         struct nfs4_opendata *p = container_of(kref,
1450                         struct nfs4_opendata, kref);
1451         struct super_block *sb = p->dentry->d_sb;
1452
1453         nfs4_lgopen_release(p->lgp);
1454         nfs_free_seqid(p->o_arg.seqid);
1455         nfs4_sequence_free_slot(&p->o_res.seq_res);
1456         if (p->state != NULL)
1457                 nfs4_put_open_state(p->state);
1458         nfs4_put_state_owner(p->owner);
1459
1460         nfs4_label_free(p->a_label);
1461         nfs4_label_free(p->f_attr.label);
1462
1463         dput(p->dir);
1464         dput(p->dentry);
1465         nfs_sb_deactive(sb);
1466         nfs_fattr_free_names(&p->f_attr);
1467         kfree(p->f_attr.mdsthreshold);
1468         kfree(p);
1469 }
1470
1471 static void nfs4_opendata_put(struct nfs4_opendata *p)
1472 {
1473         if (p != NULL)
1474                 kref_put(&p->kref, nfs4_opendata_free);
1475 }
1476
1477 static bool nfs4_mode_match_open_stateid(struct nfs4_state *state,
1478                 fmode_t fmode)
1479 {
1480         switch(fmode & (FMODE_READ|FMODE_WRITE)) {
1481         case FMODE_READ|FMODE_WRITE:
1482                 return state->n_rdwr != 0;
1483         case FMODE_WRITE:
1484                 return state->n_wronly != 0;
1485         case FMODE_READ:
1486                 return state->n_rdonly != 0;
1487         }
1488         WARN_ON_ONCE(1);
1489         return false;
1490 }
1491
1492 static int can_open_cached(struct nfs4_state *state, fmode_t mode,
1493                 int open_mode, enum open_claim_type4 claim)
1494 {
1495         int ret = 0;
1496
1497         if (open_mode & (O_EXCL|O_TRUNC))
1498                 goto out;
1499         switch (claim) {
1500         case NFS4_OPEN_CLAIM_NULL:
1501         case NFS4_OPEN_CLAIM_FH:
1502                 goto out;
1503         default:
1504                 break;
1505         }
1506         switch (mode & (FMODE_READ|FMODE_WRITE)) {
1507                 case FMODE_READ:
1508                         ret |= test_bit(NFS_O_RDONLY_STATE, &state->flags) != 0
1509                                 && state->n_rdonly != 0;
1510                         break;
1511                 case FMODE_WRITE:
1512                         ret |= test_bit(NFS_O_WRONLY_STATE, &state->flags) != 0
1513                                 && state->n_wronly != 0;
1514                         break;
1515                 case FMODE_READ|FMODE_WRITE:
1516                         ret |= test_bit(NFS_O_RDWR_STATE, &state->flags) != 0
1517                                 && state->n_rdwr != 0;
1518         }
1519 out:
1520         return ret;
1521 }
1522
1523 static int can_open_delegated(struct nfs_delegation *delegation, fmode_t fmode,
1524                 enum open_claim_type4 claim)
1525 {
1526         if (delegation == NULL)
1527                 return 0;
1528         if ((delegation->type & fmode) != fmode)
1529                 return 0;
1530         switch (claim) {
1531         case NFS4_OPEN_CLAIM_NULL:
1532         case NFS4_OPEN_CLAIM_FH:
1533                 break;
1534         case NFS4_OPEN_CLAIM_PREVIOUS:
1535                 if (!test_bit(NFS_DELEGATION_NEED_RECLAIM, &delegation->flags))
1536                         break;
1537                 fallthrough;
1538         default:
1539                 return 0;
1540         }
1541         nfs_mark_delegation_referenced(delegation);
1542         return 1;
1543 }
1544
1545 static void update_open_stateflags(struct nfs4_state *state, fmode_t fmode)
1546 {
1547         switch (fmode) {
1548                 case FMODE_WRITE:
1549                         state->n_wronly++;
1550                         break;
1551                 case FMODE_READ:
1552                         state->n_rdonly++;
1553                         break;
1554                 case FMODE_READ|FMODE_WRITE:
1555                         state->n_rdwr++;
1556         }
1557         nfs4_state_set_mode_locked(state, state->state | fmode);
1558 }
1559
1560 #ifdef CONFIG_NFS_V4_1
1561 static bool nfs_open_stateid_recover_openmode(struct nfs4_state *state)
1562 {
1563         if (state->n_rdonly && !test_bit(NFS_O_RDONLY_STATE, &state->flags))
1564                 return true;
1565         if (state->n_wronly && !test_bit(NFS_O_WRONLY_STATE, &state->flags))
1566                 return true;
1567         if (state->n_rdwr && !test_bit(NFS_O_RDWR_STATE, &state->flags))
1568                 return true;
1569         return false;
1570 }
1571 #endif /* CONFIG_NFS_V4_1 */
1572
1573 static void nfs_state_log_update_open_stateid(struct nfs4_state *state)
1574 {
1575         if (test_and_clear_bit(NFS_STATE_CHANGE_WAIT, &state->flags))
1576                 wake_up_all(&state->waitq);
1577 }
1578
1579 static void nfs_test_and_clear_all_open_stateid(struct nfs4_state *state)
1580 {
1581         struct nfs_client *clp = state->owner->so_server->nfs_client;
1582         bool need_recover = false;
1583
1584         if (test_and_clear_bit(NFS_O_RDONLY_STATE, &state->flags) && state->n_rdonly)
1585                 need_recover = true;
1586         if (test_and_clear_bit(NFS_O_WRONLY_STATE, &state->flags) && state->n_wronly)
1587                 need_recover = true;
1588         if (test_and_clear_bit(NFS_O_RDWR_STATE, &state->flags) && state->n_rdwr)
1589                 need_recover = true;
1590         if (need_recover)
1591                 nfs4_state_mark_reclaim_nograce(clp, state);
1592 }
1593
1594 /*
1595  * Check for whether or not the caller may update the open stateid
1596  * to the value passed in by stateid.
1597  *
1598  * Note: This function relies heavily on the server implementing
1599  * RFC7530 Section 9.1.4.2, and RFC5661 Section 8.2.2
1600  * correctly.
1601  * i.e. The stateid seqids have to be initialised to 1, and
1602  * are then incremented on every state transition.
1603  */
1604 static bool nfs_stateid_is_sequential(struct nfs4_state *state,
1605                 const nfs4_stateid *stateid)
1606 {
1607         if (test_bit(NFS_OPEN_STATE, &state->flags)) {
1608                 /* The common case - we're updating to a new sequence number */
1609                 if (nfs4_stateid_match_other(stateid, &state->open_stateid)) {
1610                         if (nfs4_stateid_is_next(&state->open_stateid, stateid))
1611                                 return true;
1612                         return false;
1613                 }
1614                 /* The server returned a new stateid */
1615         }
1616         /* This is the first OPEN in this generation */
1617         if (stateid->seqid == cpu_to_be32(1))
1618                 return true;
1619         return false;
1620 }
1621
1622 static void nfs_resync_open_stateid_locked(struct nfs4_state *state)
1623 {
1624         if (!(state->n_wronly || state->n_rdonly || state->n_rdwr))
1625                 return;
1626         if (state->n_wronly)
1627                 set_bit(NFS_O_WRONLY_STATE, &state->flags);
1628         if (state->n_rdonly)
1629                 set_bit(NFS_O_RDONLY_STATE, &state->flags);
1630         if (state->n_rdwr)
1631                 set_bit(NFS_O_RDWR_STATE, &state->flags);
1632         set_bit(NFS_OPEN_STATE, &state->flags);
1633 }
1634
1635 static void nfs_clear_open_stateid_locked(struct nfs4_state *state,
1636                 nfs4_stateid *stateid, fmode_t fmode)
1637 {
1638         clear_bit(NFS_O_RDWR_STATE, &state->flags);
1639         switch (fmode & (FMODE_READ|FMODE_WRITE)) {
1640         case FMODE_WRITE:
1641                 clear_bit(NFS_O_RDONLY_STATE, &state->flags);
1642                 break;
1643         case FMODE_READ:
1644                 clear_bit(NFS_O_WRONLY_STATE, &state->flags);
1645                 break;
1646         case 0:
1647                 clear_bit(NFS_O_RDONLY_STATE, &state->flags);
1648                 clear_bit(NFS_O_WRONLY_STATE, &state->flags);
1649                 clear_bit(NFS_OPEN_STATE, &state->flags);
1650         }
1651         if (stateid == NULL)
1652                 return;
1653         /* Handle OPEN+OPEN_DOWNGRADE races */
1654         if (nfs4_stateid_match_other(stateid, &state->open_stateid) &&
1655             !nfs4_stateid_is_newer(stateid, &state->open_stateid)) {
1656                 nfs_resync_open_stateid_locked(state);
1657                 goto out;
1658         }
1659         if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0)
1660                 nfs4_stateid_copy(&state->stateid, stateid);
1661         nfs4_stateid_copy(&state->open_stateid, stateid);
1662         trace_nfs4_open_stateid_update(state->inode, stateid, 0);
1663 out:
1664         nfs_state_log_update_open_stateid(state);
1665 }
1666
1667 static void nfs_clear_open_stateid(struct nfs4_state *state,
1668         nfs4_stateid *arg_stateid,
1669         nfs4_stateid *stateid, fmode_t fmode)
1670 {
1671         write_seqlock(&state->seqlock);
1672         /* Ignore, if the CLOSE argment doesn't match the current stateid */
1673         if (nfs4_state_match_open_stateid_other(state, arg_stateid))
1674                 nfs_clear_open_stateid_locked(state, stateid, fmode);
1675         write_sequnlock(&state->seqlock);
1676         if (test_bit(NFS_STATE_RECLAIM_NOGRACE, &state->flags))
1677                 nfs4_schedule_state_manager(state->owner->so_server->nfs_client);
1678 }
1679
1680 static void nfs_set_open_stateid_locked(struct nfs4_state *state,
1681                 const nfs4_stateid *stateid, nfs4_stateid *freeme)
1682         __must_hold(&state->owner->so_lock)
1683         __must_hold(&state->seqlock)
1684         __must_hold(RCU)
1685
1686 {
1687         DEFINE_WAIT(wait);
1688         int status = 0;
1689         for (;;) {
1690
1691                 if (nfs_stateid_is_sequential(state, stateid))
1692                         break;
1693
1694                 if (status)
1695                         break;
1696                 /* Rely on seqids for serialisation with NFSv4.0 */
1697                 if (!nfs4_has_session(NFS_SERVER(state->inode)->nfs_client))
1698                         break;
1699
1700                 set_bit(NFS_STATE_CHANGE_WAIT, &state->flags);
1701                 prepare_to_wait(&state->waitq, &wait, TASK_KILLABLE);
1702                 /*
1703                  * Ensure we process the state changes in the same order
1704                  * in which the server processed them by delaying the
1705                  * update of the stateid until we are in sequence.
1706                  */
1707                 write_sequnlock(&state->seqlock);
1708                 spin_unlock(&state->owner->so_lock);
1709                 rcu_read_unlock();
1710                 trace_nfs4_open_stateid_update_wait(state->inode, stateid, 0);
1711
1712                 if (!fatal_signal_pending(current)) {
1713                         if (schedule_timeout(5*HZ) == 0)
1714                                 status = -EAGAIN;
1715                         else
1716                                 status = 0;
1717                 } else
1718                         status = -EINTR;
1719                 finish_wait(&state->waitq, &wait);
1720                 rcu_read_lock();
1721                 spin_lock(&state->owner->so_lock);
1722                 write_seqlock(&state->seqlock);
1723         }
1724
1725         if (test_bit(NFS_OPEN_STATE, &state->flags) &&
1726             !nfs4_stateid_match_other(stateid, &state->open_stateid)) {
1727                 nfs4_stateid_copy(freeme, &state->open_stateid);
1728                 nfs_test_and_clear_all_open_stateid(state);
1729         }
1730
1731         if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0)
1732                 nfs4_stateid_copy(&state->stateid, stateid);
1733         nfs4_stateid_copy(&state->open_stateid, stateid);
1734         trace_nfs4_open_stateid_update(state->inode, stateid, status);
1735         nfs_state_log_update_open_stateid(state);
1736 }
1737
1738 static void nfs_state_set_open_stateid(struct nfs4_state *state,
1739                 const nfs4_stateid *open_stateid,
1740                 fmode_t fmode,
1741                 nfs4_stateid *freeme)
1742 {
1743         /*
1744          * Protect the call to nfs4_state_set_mode_locked and
1745          * serialise the stateid update
1746          */
1747         write_seqlock(&state->seqlock);
1748         nfs_set_open_stateid_locked(state, open_stateid, freeme);
1749         switch (fmode) {
1750         case FMODE_READ:
1751                 set_bit(NFS_O_RDONLY_STATE, &state->flags);
1752                 break;
1753         case FMODE_WRITE:
1754                 set_bit(NFS_O_WRONLY_STATE, &state->flags);
1755                 break;
1756         case FMODE_READ|FMODE_WRITE:
1757                 set_bit(NFS_O_RDWR_STATE, &state->flags);
1758         }
1759         set_bit(NFS_OPEN_STATE, &state->flags);
1760         write_sequnlock(&state->seqlock);
1761 }
1762
1763 static void nfs_state_clear_open_state_flags(struct nfs4_state *state)
1764 {
1765         clear_bit(NFS_O_RDWR_STATE, &state->flags);
1766         clear_bit(NFS_O_WRONLY_STATE, &state->flags);
1767         clear_bit(NFS_O_RDONLY_STATE, &state->flags);
1768         clear_bit(NFS_OPEN_STATE, &state->flags);
1769 }
1770
1771 static void nfs_state_set_delegation(struct nfs4_state *state,
1772                 const nfs4_stateid *deleg_stateid,
1773                 fmode_t fmode)
1774 {
1775         /*
1776          * Protect the call to nfs4_state_set_mode_locked and
1777          * serialise the stateid update
1778          */
1779         write_seqlock(&state->seqlock);
1780         nfs4_stateid_copy(&state->stateid, deleg_stateid);
1781         set_bit(NFS_DELEGATED_STATE, &state->flags);
1782         write_sequnlock(&state->seqlock);
1783 }
1784
1785 static void nfs_state_clear_delegation(struct nfs4_state *state)
1786 {
1787         write_seqlock(&state->seqlock);
1788         nfs4_stateid_copy(&state->stateid, &state->open_stateid);
1789         clear_bit(NFS_DELEGATED_STATE, &state->flags);
1790         write_sequnlock(&state->seqlock);
1791 }
1792
1793 int update_open_stateid(struct nfs4_state *state,
1794                 const nfs4_stateid *open_stateid,
1795                 const nfs4_stateid *delegation,
1796                 fmode_t fmode)
1797 {
1798         struct nfs_server *server = NFS_SERVER(state->inode);
1799         struct nfs_client *clp = server->nfs_client;
1800         struct nfs_inode *nfsi = NFS_I(state->inode);
1801         struct nfs_delegation *deleg_cur;
1802         nfs4_stateid freeme = { };
1803         int ret = 0;
1804
1805         fmode &= (FMODE_READ|FMODE_WRITE);
1806
1807         rcu_read_lock();
1808         spin_lock(&state->owner->so_lock);
1809         if (open_stateid != NULL) {
1810                 nfs_state_set_open_stateid(state, open_stateid, fmode, &freeme);
1811                 ret = 1;
1812         }
1813
1814         deleg_cur = nfs4_get_valid_delegation(state->inode);
1815         if (deleg_cur == NULL)
1816                 goto no_delegation;
1817
1818         spin_lock(&deleg_cur->lock);
1819         if (rcu_dereference(nfsi->delegation) != deleg_cur ||
1820            test_bit(NFS_DELEGATION_RETURNING, &deleg_cur->flags) ||
1821             (deleg_cur->type & fmode) != fmode)
1822                 goto no_delegation_unlock;
1823
1824         if (delegation == NULL)
1825                 delegation = &deleg_cur->stateid;
1826         else if (!nfs4_stateid_match_other(&deleg_cur->stateid, delegation))
1827                 goto no_delegation_unlock;
1828
1829         nfs_mark_delegation_referenced(deleg_cur);
1830         nfs_state_set_delegation(state, &deleg_cur->stateid, fmode);
1831         ret = 1;
1832 no_delegation_unlock:
1833         spin_unlock(&deleg_cur->lock);
1834 no_delegation:
1835         if (ret)
1836                 update_open_stateflags(state, fmode);
1837         spin_unlock(&state->owner->so_lock);
1838         rcu_read_unlock();
1839
1840         if (test_bit(NFS_STATE_RECLAIM_NOGRACE, &state->flags))
1841                 nfs4_schedule_state_manager(clp);
1842         if (freeme.type != 0)
1843                 nfs4_test_and_free_stateid(server, &freeme,
1844                                 state->owner->so_cred);
1845
1846         return ret;
1847 }
1848
1849 static bool nfs4_update_lock_stateid(struct nfs4_lock_state *lsp,
1850                 const nfs4_stateid *stateid)
1851 {
1852         struct nfs4_state *state = lsp->ls_state;
1853         bool ret = false;
1854
1855         spin_lock(&state->state_lock);
1856         if (!nfs4_stateid_match_other(stateid, &lsp->ls_stateid))
1857                 goto out_noupdate;
1858         if (!nfs4_stateid_is_newer(stateid, &lsp->ls_stateid))
1859                 goto out_noupdate;
1860         nfs4_stateid_copy(&lsp->ls_stateid, stateid);
1861         ret = true;
1862 out_noupdate:
1863         spin_unlock(&state->state_lock);
1864         return ret;
1865 }
1866
1867 static void nfs4_return_incompatible_delegation(struct inode *inode, fmode_t fmode)
1868 {
1869         struct nfs_delegation *delegation;
1870
1871         fmode &= FMODE_READ|FMODE_WRITE;
1872         rcu_read_lock();
1873         delegation = nfs4_get_valid_delegation(inode);
1874         if (delegation == NULL || (delegation->type & fmode) == fmode) {
1875                 rcu_read_unlock();
1876                 return;
1877         }
1878         rcu_read_unlock();
1879         nfs4_inode_return_delegation(inode);
1880 }
1881
1882 static struct nfs4_state *nfs4_try_open_cached(struct nfs4_opendata *opendata)
1883 {
1884         struct nfs4_state *state = opendata->state;
1885         struct nfs_delegation *delegation;
1886         int open_mode = opendata->o_arg.open_flags;
1887         fmode_t fmode = opendata->o_arg.fmode;
1888         enum open_claim_type4 claim = opendata->o_arg.claim;
1889         nfs4_stateid stateid;
1890         int ret = -EAGAIN;
1891
1892         for (;;) {
1893                 spin_lock(&state->owner->so_lock);
1894                 if (can_open_cached(state, fmode, open_mode, claim)) {
1895                         update_open_stateflags(state, fmode);
1896                         spin_unlock(&state->owner->so_lock);
1897                         goto out_return_state;
1898                 }
1899                 spin_unlock(&state->owner->so_lock);
1900                 rcu_read_lock();
1901                 delegation = nfs4_get_valid_delegation(state->inode);
1902                 if (!can_open_delegated(delegation, fmode, claim)) {
1903                         rcu_read_unlock();
1904                         break;
1905                 }
1906                 /* Save the delegation */
1907                 nfs4_stateid_copy(&stateid, &delegation->stateid);
1908                 rcu_read_unlock();
1909                 nfs_release_seqid(opendata->o_arg.seqid);
1910                 if (!opendata->is_recover) {
1911                         ret = nfs_may_open(state->inode, state->owner->so_cred, open_mode);
1912                         if (ret != 0)
1913                                 goto out;
1914                 }
1915                 ret = -EAGAIN;
1916
1917                 /* Try to update the stateid using the delegation */
1918                 if (update_open_stateid(state, NULL, &stateid, fmode))
1919                         goto out_return_state;
1920         }
1921 out:
1922         return ERR_PTR(ret);
1923 out_return_state:
1924         refcount_inc(&state->count);
1925         return state;
1926 }
1927
1928 static void
1929 nfs4_opendata_check_deleg(struct nfs4_opendata *data, struct nfs4_state *state)
1930 {
1931         struct nfs_client *clp = NFS_SERVER(state->inode)->nfs_client;
1932         struct nfs_delegation *delegation;
1933         int delegation_flags = 0;
1934
1935         rcu_read_lock();
1936         delegation = rcu_dereference(NFS_I(state->inode)->delegation);
1937         if (delegation)
1938                 delegation_flags = delegation->flags;
1939         rcu_read_unlock();
1940         switch (data->o_arg.claim) {
1941         default:
1942                 break;
1943         case NFS4_OPEN_CLAIM_DELEGATE_CUR:
1944         case NFS4_OPEN_CLAIM_DELEG_CUR_FH:
1945                 pr_err_ratelimited("NFS: Broken NFSv4 server %s is "
1946                                    "returning a delegation for "
1947                                    "OPEN(CLAIM_DELEGATE_CUR)\n",
1948                                    clp->cl_hostname);
1949                 return;
1950         }
1951         if ((delegation_flags & 1UL<<NFS_DELEGATION_NEED_RECLAIM) == 0)
1952                 nfs_inode_set_delegation(state->inode,
1953                                 data->owner->so_cred,
1954                                 data->o_res.delegation_type,
1955                                 &data->o_res.delegation,
1956                                 data->o_res.pagemod_limit);
1957         else
1958                 nfs_inode_reclaim_delegation(state->inode,
1959                                 data->owner->so_cred,
1960                                 data->o_res.delegation_type,
1961                                 &data->o_res.delegation,
1962                                 data->o_res.pagemod_limit);
1963
1964         if (data->o_res.do_recall)
1965                 nfs_async_inode_return_delegation(state->inode,
1966                                                   &data->o_res.delegation);
1967 }
1968
1969 /*
1970  * Check the inode attributes against the CLAIM_PREVIOUS returned attributes
1971  * and update the nfs4_state.
1972  */
1973 static struct nfs4_state *
1974 _nfs4_opendata_reclaim_to_nfs4_state(struct nfs4_opendata *data)
1975 {
1976         struct inode *inode = data->state->inode;
1977         struct nfs4_state *state = data->state;
1978         int ret;
1979
1980         if (!data->rpc_done) {
1981                 if (data->rpc_status)
1982                         return ERR_PTR(data->rpc_status);
1983                 return nfs4_try_open_cached(data);
1984         }
1985
1986         ret = nfs_refresh_inode(inode, &data->f_attr);
1987         if (ret)
1988                 return ERR_PTR(ret);
1989
1990         if (data->o_res.delegation_type != 0)
1991                 nfs4_opendata_check_deleg(data, state);
1992
1993         if (!update_open_stateid(state, &data->o_res.stateid,
1994                                 NULL, data->o_arg.fmode))
1995                 return ERR_PTR(-EAGAIN);
1996         refcount_inc(&state->count);
1997
1998         return state;
1999 }
2000
2001 static struct inode *
2002 nfs4_opendata_get_inode(struct nfs4_opendata *data)
2003 {
2004         struct inode *inode;
2005
2006         switch (data->o_arg.claim) {
2007         case NFS4_OPEN_CLAIM_NULL:
2008         case NFS4_OPEN_CLAIM_DELEGATE_CUR:
2009         case NFS4_OPEN_CLAIM_DELEGATE_PREV:
2010                 if (!(data->f_attr.valid & NFS_ATTR_FATTR))
2011                         return ERR_PTR(-EAGAIN);
2012                 inode = nfs_fhget(data->dir->d_sb, &data->o_res.fh,
2013                                 &data->f_attr);
2014                 break;
2015         default:
2016                 inode = d_inode(data->dentry);
2017                 ihold(inode);
2018                 nfs_refresh_inode(inode, &data->f_attr);
2019         }
2020         return inode;
2021 }
2022
2023 static struct nfs4_state *
2024 nfs4_opendata_find_nfs4_state(struct nfs4_opendata *data)
2025 {
2026         struct nfs4_state *state;
2027         struct inode *inode;
2028
2029         inode = nfs4_opendata_get_inode(data);
2030         if (IS_ERR(inode))
2031                 return ERR_CAST(inode);
2032         if (data->state != NULL && data->state->inode == inode) {
2033                 state = data->state;
2034                 refcount_inc(&state->count);
2035         } else
2036                 state = nfs4_get_open_state(inode, data->owner);
2037         iput(inode);
2038         if (state == NULL)
2039                 state = ERR_PTR(-ENOMEM);
2040         return state;
2041 }
2042
2043 static struct nfs4_state *
2044 _nfs4_opendata_to_nfs4_state(struct nfs4_opendata *data)
2045 {
2046         struct nfs4_state *state;
2047
2048         if (!data->rpc_done) {
2049                 state = nfs4_try_open_cached(data);
2050                 trace_nfs4_cached_open(data->state);
2051                 goto out;
2052         }
2053
2054         state = nfs4_opendata_find_nfs4_state(data);
2055         if (IS_ERR(state))
2056                 goto out;
2057
2058         if (data->o_res.delegation_type != 0)
2059                 nfs4_opendata_check_deleg(data, state);
2060         if (!update_open_stateid(state, &data->o_res.stateid,
2061                                 NULL, data->o_arg.fmode)) {
2062                 nfs4_put_open_state(state);
2063                 state = ERR_PTR(-EAGAIN);
2064         }
2065 out:
2066         nfs_release_seqid(data->o_arg.seqid);
2067         return state;
2068 }
2069
2070 static struct nfs4_state *
2071 nfs4_opendata_to_nfs4_state(struct nfs4_opendata *data)
2072 {
2073         struct nfs4_state *ret;
2074
2075         if (data->o_arg.claim == NFS4_OPEN_CLAIM_PREVIOUS)
2076                 ret =_nfs4_opendata_reclaim_to_nfs4_state(data);
2077         else
2078                 ret = _nfs4_opendata_to_nfs4_state(data);
2079         nfs4_sequence_free_slot(&data->o_res.seq_res);
2080         return ret;
2081 }
2082
2083 static struct nfs_open_context *
2084 nfs4_state_find_open_context_mode(struct nfs4_state *state, fmode_t mode)
2085 {
2086         struct nfs_inode *nfsi = NFS_I(state->inode);
2087         struct nfs_open_context *ctx;
2088
2089         rcu_read_lock();
2090         list_for_each_entry_rcu(ctx, &nfsi->open_files, list) {
2091                 if (ctx->state != state)
2092                         continue;
2093                 if ((ctx->mode & mode) != mode)
2094                         continue;
2095                 if (!get_nfs_open_context(ctx))
2096                         continue;
2097                 rcu_read_unlock();
2098                 return ctx;
2099         }
2100         rcu_read_unlock();
2101         return ERR_PTR(-ENOENT);
2102 }
2103
2104 static struct nfs_open_context *
2105 nfs4_state_find_open_context(struct nfs4_state *state)
2106 {
2107         struct nfs_open_context *ctx;
2108
2109         ctx = nfs4_state_find_open_context_mode(state, FMODE_READ|FMODE_WRITE);
2110         if (!IS_ERR(ctx))
2111                 return ctx;
2112         ctx = nfs4_state_find_open_context_mode(state, FMODE_WRITE);
2113         if (!IS_ERR(ctx))
2114                 return ctx;
2115         return nfs4_state_find_open_context_mode(state, FMODE_READ);
2116 }
2117
2118 static struct nfs4_opendata *nfs4_open_recoverdata_alloc(struct nfs_open_context *ctx,
2119                 struct nfs4_state *state, enum open_claim_type4 claim)
2120 {
2121         struct nfs4_opendata *opendata;
2122
2123         opendata = nfs4_opendata_alloc(ctx->dentry, state->owner, 0, 0,
2124                         NULL, claim, GFP_NOFS);
2125         if (opendata == NULL)
2126                 return ERR_PTR(-ENOMEM);
2127         opendata->state = state;
2128         refcount_inc(&state->count);
2129         return opendata;
2130 }
2131
2132 static int nfs4_open_recover_helper(struct nfs4_opendata *opendata,
2133                                     fmode_t fmode)
2134 {
2135         struct nfs4_state *newstate;
2136         struct nfs_server *server = NFS_SB(opendata->dentry->d_sb);
2137         int openflags = opendata->o_arg.open_flags;
2138         int ret;
2139
2140         if (!nfs4_mode_match_open_stateid(opendata->state, fmode))
2141                 return 0;
2142         opendata->o_arg.fmode = fmode;
2143         opendata->o_arg.share_access =
2144                 nfs4_map_atomic_open_share(server, fmode, openflags);
2145         memset(&opendata->o_res, 0, sizeof(opendata->o_res));
2146         memset(&opendata->c_res, 0, sizeof(opendata->c_res));
2147         nfs4_init_opendata_res(opendata);
2148         ret = _nfs4_recover_proc_open(opendata);
2149         if (ret != 0)
2150                 return ret;
2151         newstate = nfs4_opendata_to_nfs4_state(opendata);
2152         if (IS_ERR(newstate))
2153                 return PTR_ERR(newstate);
2154         if (newstate != opendata->state)
2155                 ret = -ESTALE;
2156         nfs4_close_state(newstate, fmode);
2157         return ret;
2158 }
2159
2160 static int nfs4_open_recover(struct nfs4_opendata *opendata, struct nfs4_state *state)
2161 {
2162         int ret;
2163
2164         /* memory barrier prior to reading state->n_* */
2165         smp_rmb();
2166         ret = nfs4_open_recover_helper(opendata, FMODE_READ|FMODE_WRITE);
2167         if (ret != 0)
2168                 return ret;
2169         ret = nfs4_open_recover_helper(opendata, FMODE_WRITE);
2170         if (ret != 0)
2171                 return ret;
2172         ret = nfs4_open_recover_helper(opendata, FMODE_READ);
2173         if (ret != 0)
2174                 return ret;
2175         /*
2176          * We may have performed cached opens for all three recoveries.
2177          * Check if we need to update the current stateid.
2178          */
2179         if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0 &&
2180             !nfs4_stateid_match(&state->stateid, &state->open_stateid)) {
2181                 write_seqlock(&state->seqlock);
2182                 if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0)
2183                         nfs4_stateid_copy(&state->stateid, &state->open_stateid);
2184                 write_sequnlock(&state->seqlock);
2185         }
2186         return 0;
2187 }
2188
2189 /*
2190  * OPEN_RECLAIM:
2191  *      reclaim state on the server after a reboot.
2192  */
2193 static int _nfs4_do_open_reclaim(struct nfs_open_context *ctx, struct nfs4_state *state)
2194 {
2195         struct nfs_delegation *delegation;
2196         struct nfs4_opendata *opendata;
2197         fmode_t delegation_type = 0;
2198         int status;
2199
2200         opendata = nfs4_open_recoverdata_alloc(ctx, state,
2201                         NFS4_OPEN_CLAIM_PREVIOUS);
2202         if (IS_ERR(opendata))
2203                 return PTR_ERR(opendata);
2204         rcu_read_lock();
2205         delegation = rcu_dereference(NFS_I(state->inode)->delegation);
2206         if (delegation != NULL && test_bit(NFS_DELEGATION_NEED_RECLAIM, &delegation->flags) != 0)
2207                 delegation_type = delegation->type;
2208         rcu_read_unlock();
2209         opendata->o_arg.u.delegation_type = delegation_type;
2210         status = nfs4_open_recover(opendata, state);
2211         nfs4_opendata_put(opendata);
2212         return status;
2213 }
2214
2215 static int nfs4_do_open_reclaim(struct nfs_open_context *ctx, struct nfs4_state *state)
2216 {
2217         struct nfs_server *server = NFS_SERVER(state->inode);
2218         struct nfs4_exception exception = { };
2219         int err;
2220         do {
2221                 err = _nfs4_do_open_reclaim(ctx, state);
2222                 trace_nfs4_open_reclaim(ctx, 0, err);
2223                 if (nfs4_clear_cap_atomic_open_v1(server, err, &exception))
2224                         continue;
2225                 if (err != -NFS4ERR_DELAY)
2226                         break;
2227                 nfs4_handle_exception(server, err, &exception);
2228         } while (exception.retry);
2229         return err;
2230 }
2231
2232 static int nfs4_open_reclaim(struct nfs4_state_owner *sp, struct nfs4_state *state)
2233 {
2234         struct nfs_open_context *ctx;
2235         int ret;
2236
2237         ctx = nfs4_state_find_open_context(state);
2238         if (IS_ERR(ctx))
2239                 return -EAGAIN;
2240         clear_bit(NFS_DELEGATED_STATE, &state->flags);
2241         nfs_state_clear_open_state_flags(state);
2242         ret = nfs4_do_open_reclaim(ctx, state);
2243         put_nfs_open_context(ctx);
2244         return ret;
2245 }
2246
2247 static int nfs4_handle_delegation_recall_error(struct nfs_server *server, struct nfs4_state *state, const nfs4_stateid *stateid, struct file_lock *fl, int err)
2248 {
2249         switch (err) {
2250                 default:
2251                         printk(KERN_ERR "NFS: %s: unhandled error "
2252                                         "%d.\n", __func__, err);
2253                         fallthrough;
2254                 case 0:
2255                 case -ENOENT:
2256                 case -EAGAIN:
2257                 case -ESTALE:
2258                 case -ETIMEDOUT:
2259                         break;
2260                 case -NFS4ERR_BADSESSION:
2261                 case -NFS4ERR_BADSLOT:
2262                 case -NFS4ERR_BAD_HIGH_SLOT:
2263                 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
2264                 case -NFS4ERR_DEADSESSION:
2265                         return -EAGAIN;
2266                 case -NFS4ERR_STALE_CLIENTID:
2267                 case -NFS4ERR_STALE_STATEID:
2268                         /* Don't recall a delegation if it was lost */
2269                         nfs4_schedule_lease_recovery(server->nfs_client);
2270                         return -EAGAIN;
2271                 case -NFS4ERR_MOVED:
2272                         nfs4_schedule_migration_recovery(server);
2273                         return -EAGAIN;
2274                 case -NFS4ERR_LEASE_MOVED:
2275                         nfs4_schedule_lease_moved_recovery(server->nfs_client);
2276                         return -EAGAIN;
2277                 case -NFS4ERR_DELEG_REVOKED:
2278                 case -NFS4ERR_ADMIN_REVOKED:
2279                 case -NFS4ERR_EXPIRED:
2280                 case -NFS4ERR_BAD_STATEID:
2281                 case -NFS4ERR_OPENMODE:
2282                         nfs_inode_find_state_and_recover(state->inode,
2283                                         stateid);
2284                         nfs4_schedule_stateid_recovery(server, state);
2285                         return -EAGAIN;
2286                 case -NFS4ERR_DELAY:
2287                 case -NFS4ERR_GRACE:
2288                         ssleep(1);
2289                         return -EAGAIN;
2290                 case -ENOMEM:
2291                 case -NFS4ERR_DENIED:
2292                         if (fl) {
2293                                 struct nfs4_lock_state *lsp = fl->fl_u.nfs4_fl.owner;
2294                                 if (lsp)
2295                                         set_bit(NFS_LOCK_LOST, &lsp->ls_flags);
2296                         }
2297                         return 0;
2298         }
2299         return err;
2300 }
2301
2302 int nfs4_open_delegation_recall(struct nfs_open_context *ctx,
2303                 struct nfs4_state *state, const nfs4_stateid *stateid)
2304 {
2305         struct nfs_server *server = NFS_SERVER(state->inode);
2306         struct nfs4_opendata *opendata;
2307         int err = 0;
2308
2309         opendata = nfs4_open_recoverdata_alloc(ctx, state,
2310                         NFS4_OPEN_CLAIM_DELEG_CUR_FH);
2311         if (IS_ERR(opendata))
2312                 return PTR_ERR(opendata);
2313         nfs4_stateid_copy(&opendata->o_arg.u.delegation, stateid);
2314         if (!test_bit(NFS_O_RDWR_STATE, &state->flags)) {
2315                 err = nfs4_open_recover_helper(opendata, FMODE_READ|FMODE_WRITE);
2316                 if (err)
2317                         goto out;
2318         }
2319         if (!test_bit(NFS_O_WRONLY_STATE, &state->flags)) {
2320                 err = nfs4_open_recover_helper(opendata, FMODE_WRITE);
2321                 if (err)
2322                         goto out;
2323         }
2324         if (!test_bit(NFS_O_RDONLY_STATE, &state->flags)) {
2325                 err = nfs4_open_recover_helper(opendata, FMODE_READ);
2326                 if (err)
2327                         goto out;
2328         }
2329         nfs_state_clear_delegation(state);
2330 out:
2331         nfs4_opendata_put(opendata);
2332         return nfs4_handle_delegation_recall_error(server, state, stateid, NULL, err);
2333 }
2334
2335 static void nfs4_open_confirm_prepare(struct rpc_task *task, void *calldata)
2336 {
2337         struct nfs4_opendata *data = calldata;
2338
2339         nfs4_setup_sequence(data->o_arg.server->nfs_client,
2340                            &data->c_arg.seq_args, &data->c_res.seq_res, task);
2341 }
2342
2343 static void nfs4_open_confirm_done(struct rpc_task *task, void *calldata)
2344 {
2345         struct nfs4_opendata *data = calldata;
2346
2347         nfs40_sequence_done(task, &data->c_res.seq_res);
2348
2349         data->rpc_status = task->tk_status;
2350         if (data->rpc_status == 0) {
2351                 nfs4_stateid_copy(&data->o_res.stateid, &data->c_res.stateid);
2352                 nfs_confirm_seqid(&data->owner->so_seqid, 0);
2353                 renew_lease(data->o_res.server, data->timestamp);
2354                 data->rpc_done = true;
2355         }
2356 }
2357
2358 static void nfs4_open_confirm_release(void *calldata)
2359 {
2360         struct nfs4_opendata *data = calldata;
2361         struct nfs4_state *state = NULL;
2362
2363         /* If this request hasn't been cancelled, do nothing */
2364         if (!data->cancelled)
2365                 goto out_free;
2366         /* In case of error, no cleanup! */
2367         if (!data->rpc_done)
2368                 goto out_free;
2369         state = nfs4_opendata_to_nfs4_state(data);
2370         if (!IS_ERR(state))
2371                 nfs4_close_state(state, data->o_arg.fmode);
2372 out_free:
2373         nfs4_opendata_put(data);
2374 }
2375
2376 static const struct rpc_call_ops nfs4_open_confirm_ops = {
2377         .rpc_call_prepare = nfs4_open_confirm_prepare,
2378         .rpc_call_done = nfs4_open_confirm_done,
2379         .rpc_release = nfs4_open_confirm_release,
2380 };
2381
2382 /*
2383  * Note: On error, nfs4_proc_open_confirm will free the struct nfs4_opendata
2384  */
2385 static int _nfs4_proc_open_confirm(struct nfs4_opendata *data)
2386 {
2387         struct nfs_server *server = NFS_SERVER(d_inode(data->dir));
2388         struct rpc_task *task;
2389         struct  rpc_message msg = {
2390                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_CONFIRM],
2391                 .rpc_argp = &data->c_arg,
2392                 .rpc_resp = &data->c_res,
2393                 .rpc_cred = data->owner->so_cred,
2394         };
2395         struct rpc_task_setup task_setup_data = {
2396                 .rpc_client = server->client,
2397                 .rpc_message = &msg,
2398                 .callback_ops = &nfs4_open_confirm_ops,
2399                 .callback_data = data,
2400                 .workqueue = nfsiod_workqueue,
2401                 .flags = RPC_TASK_ASYNC | RPC_TASK_CRED_NOREF,
2402         };
2403         int status;
2404
2405         nfs4_init_sequence(&data->c_arg.seq_args, &data->c_res.seq_res, 1,
2406                                 data->is_recover);
2407         kref_get(&data->kref);
2408         data->rpc_done = false;
2409         data->rpc_status = 0;
2410         data->timestamp = jiffies;
2411         task = rpc_run_task(&task_setup_data);
2412         if (IS_ERR(task))
2413                 return PTR_ERR(task);
2414         status = rpc_wait_for_completion_task(task);
2415         if (status != 0) {
2416                 data->cancelled = true;
2417                 smp_wmb();
2418         } else
2419                 status = data->rpc_status;
2420         rpc_put_task(task);
2421         return status;
2422 }
2423
2424 static void nfs4_open_prepare(struct rpc_task *task, void *calldata)
2425 {
2426         struct nfs4_opendata *data = calldata;
2427         struct nfs4_state_owner *sp = data->owner;
2428         struct nfs_client *clp = sp->so_server->nfs_client;
2429         enum open_claim_type4 claim = data->o_arg.claim;
2430
2431         if (nfs_wait_on_sequence(data->o_arg.seqid, task) != 0)
2432                 goto out_wait;
2433         /*
2434          * Check if we still need to send an OPEN call, or if we can use
2435          * a delegation instead.
2436          */
2437         if (data->state != NULL) {
2438                 struct nfs_delegation *delegation;
2439
2440                 if (can_open_cached(data->state, data->o_arg.fmode,
2441                                         data->o_arg.open_flags, claim))
2442                         goto out_no_action;
2443                 rcu_read_lock();
2444                 delegation = nfs4_get_valid_delegation(data->state->inode);
2445                 if (can_open_delegated(delegation, data->o_arg.fmode, claim))
2446                         goto unlock_no_action;
2447                 rcu_read_unlock();
2448         }
2449         /* Update client id. */
2450         data->o_arg.clientid = clp->cl_clientid;
2451         switch (claim) {
2452         default:
2453                 break;
2454         case NFS4_OPEN_CLAIM_PREVIOUS:
2455         case NFS4_OPEN_CLAIM_DELEG_CUR_FH:
2456         case NFS4_OPEN_CLAIM_DELEG_PREV_FH:
2457                 data->o_arg.open_bitmap = &nfs4_open_noattr_bitmap[0];
2458                 fallthrough;
2459         case NFS4_OPEN_CLAIM_FH:
2460                 task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_NOATTR];
2461         }
2462         data->timestamp = jiffies;
2463         if (nfs4_setup_sequence(data->o_arg.server->nfs_client,
2464                                 &data->o_arg.seq_args,
2465                                 &data->o_res.seq_res,
2466                                 task) != 0)
2467                 nfs_release_seqid(data->o_arg.seqid);
2468
2469         /* Set the create mode (note dependency on the session type) */
2470         data->o_arg.createmode = NFS4_CREATE_UNCHECKED;
2471         if (data->o_arg.open_flags & O_EXCL) {
2472                 data->o_arg.createmode = NFS4_CREATE_EXCLUSIVE4_1;
2473                 if (clp->cl_mvops->minor_version == 0) {
2474                         data->o_arg.createmode = NFS4_CREATE_EXCLUSIVE;
2475                         /* don't put an ACCESS op in OPEN compound if O_EXCL,
2476                          * because ACCESS will return permission denied for
2477                          * all bits until close */
2478                         data->o_res.access_request = data->o_arg.access = 0;
2479                 } else if (nfs4_has_persistent_session(clp))
2480                         data->o_arg.createmode = NFS4_CREATE_GUARDED;
2481         }
2482         return;
2483 unlock_no_action:
2484         trace_nfs4_cached_open(data->state);
2485         rcu_read_unlock();
2486 out_no_action:
2487         task->tk_action = NULL;
2488 out_wait:
2489         nfs4_sequence_done(task, &data->o_res.seq_res);
2490 }
2491
2492 static void nfs4_open_done(struct rpc_task *task, void *calldata)
2493 {
2494         struct nfs4_opendata *data = calldata;
2495
2496         data->rpc_status = task->tk_status;
2497
2498         if (!nfs4_sequence_process(task, &data->o_res.seq_res))
2499                 return;
2500
2501         if (task->tk_status == 0) {
2502                 if (data->o_res.f_attr->valid & NFS_ATTR_FATTR_TYPE) {
2503                         switch (data->o_res.f_attr->mode & S_IFMT) {
2504                         case S_IFREG:
2505                                 break;
2506                         case S_IFLNK:
2507                                 data->rpc_status = -ELOOP;
2508                                 break;
2509                         case S_IFDIR:
2510                                 data->rpc_status = -EISDIR;
2511                                 break;
2512                         default:
2513                                 data->rpc_status = -ENOTDIR;
2514                         }
2515                 }
2516                 renew_lease(data->o_res.server, data->timestamp);
2517                 if (!(data->o_res.rflags & NFS4_OPEN_RESULT_CONFIRM))
2518                         nfs_confirm_seqid(&data->owner->so_seqid, 0);
2519         }
2520         data->rpc_done = true;
2521 }
2522
2523 static void nfs4_open_release(void *calldata)
2524 {
2525         struct nfs4_opendata *data = calldata;
2526         struct nfs4_state *state = NULL;
2527
2528         /* If this request hasn't been cancelled, do nothing */
2529         if (!data->cancelled)
2530                 goto out_free;
2531         /* In case of error, no cleanup! */
2532         if (data->rpc_status != 0 || !data->rpc_done)
2533                 goto out_free;
2534         /* In case we need an open_confirm, no cleanup! */
2535         if (data->o_res.rflags & NFS4_OPEN_RESULT_CONFIRM)
2536                 goto out_free;
2537         state = nfs4_opendata_to_nfs4_state(data);
2538         if (!IS_ERR(state))
2539                 nfs4_close_state(state, data->o_arg.fmode);
2540 out_free:
2541         nfs4_opendata_put(data);
2542 }
2543
2544 static const struct rpc_call_ops nfs4_open_ops = {
2545         .rpc_call_prepare = nfs4_open_prepare,
2546         .rpc_call_done = nfs4_open_done,
2547         .rpc_release = nfs4_open_release,
2548 };
2549
2550 static int nfs4_run_open_task(struct nfs4_opendata *data,
2551                               struct nfs_open_context *ctx)
2552 {
2553         struct inode *dir = d_inode(data->dir);
2554         struct nfs_server *server = NFS_SERVER(dir);
2555         struct nfs_openargs *o_arg = &data->o_arg;
2556         struct nfs_openres *o_res = &data->o_res;
2557         struct rpc_task *task;
2558         struct rpc_message msg = {
2559                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN],
2560                 .rpc_argp = o_arg,
2561                 .rpc_resp = o_res,
2562                 .rpc_cred = data->owner->so_cred,
2563         };
2564         struct rpc_task_setup task_setup_data = {
2565                 .rpc_client = server->client,
2566                 .rpc_message = &msg,
2567                 .callback_ops = &nfs4_open_ops,
2568                 .callback_data = data,
2569                 .workqueue = nfsiod_workqueue,
2570                 .flags = RPC_TASK_ASYNC | RPC_TASK_CRED_NOREF,
2571         };
2572         int status;
2573
2574         if (nfs_server_capable(dir, NFS_CAP_MOVEABLE))
2575                 task_setup_data.flags |= RPC_TASK_MOVEABLE;
2576
2577         kref_get(&data->kref);
2578         data->rpc_done = false;
2579         data->rpc_status = 0;
2580         data->cancelled = false;
2581         data->is_recover = false;
2582         if (!ctx) {
2583                 nfs4_init_sequence(&o_arg->seq_args, &o_res->seq_res, 1, 1);
2584                 data->is_recover = true;
2585                 task_setup_data.flags |= RPC_TASK_TIMEOUT;
2586         } else {
2587                 nfs4_init_sequence(&o_arg->seq_args, &o_res->seq_res, 1, 0);
2588                 pnfs_lgopen_prepare(data, ctx);
2589         }
2590         task = rpc_run_task(&task_setup_data);
2591         if (IS_ERR(task))
2592                 return PTR_ERR(task);
2593         status = rpc_wait_for_completion_task(task);
2594         if (status != 0) {
2595                 data->cancelled = true;
2596                 smp_wmb();
2597         } else
2598                 status = data->rpc_status;
2599         rpc_put_task(task);
2600
2601         return status;
2602 }
2603
2604 static int _nfs4_recover_proc_open(struct nfs4_opendata *data)
2605 {
2606         struct inode *dir = d_inode(data->dir);
2607         struct nfs_openres *o_res = &data->o_res;
2608         int status;
2609
2610         status = nfs4_run_open_task(data, NULL);
2611         if (status != 0 || !data->rpc_done)
2612                 return status;
2613
2614         nfs_fattr_map_and_free_names(NFS_SERVER(dir), &data->f_attr);
2615
2616         if (o_res->rflags & NFS4_OPEN_RESULT_CONFIRM)
2617                 status = _nfs4_proc_open_confirm(data);
2618
2619         return status;
2620 }
2621
2622 /*
2623  * Additional permission checks in order to distinguish between an
2624  * open for read, and an open for execute. This works around the
2625  * fact that NFSv4 OPEN treats read and execute permissions as being
2626  * the same.
2627  * Note that in the non-execute case, we want to turn off permission
2628  * checking if we just created a new file (POSIX open() semantics).
2629  */
2630 static int nfs4_opendata_access(const struct cred *cred,
2631                                 struct nfs4_opendata *opendata,
2632                                 struct nfs4_state *state, fmode_t fmode)
2633 {
2634         struct nfs_access_entry cache;
2635         u32 mask, flags;
2636
2637         /* access call failed or for some reason the server doesn't
2638          * support any access modes -- defer access call until later */
2639         if (opendata->o_res.access_supported == 0)
2640                 return 0;
2641
2642         mask = 0;
2643         if (fmode & FMODE_EXEC) {
2644                 /* ONLY check for exec rights */
2645                 if (S_ISDIR(state->inode->i_mode))
2646                         mask = NFS4_ACCESS_LOOKUP;
2647                 else
2648                         mask = NFS4_ACCESS_EXECUTE;
2649         } else if ((fmode & FMODE_READ) && !opendata->file_created)
2650                 mask = NFS4_ACCESS_READ;
2651
2652         nfs_access_set_mask(&cache, opendata->o_res.access_result);
2653         nfs_access_add_cache(state->inode, &cache, cred);
2654
2655         flags = NFS4_ACCESS_READ | NFS4_ACCESS_EXECUTE | NFS4_ACCESS_LOOKUP;
2656         if ((mask & ~cache.mask & flags) == 0)
2657                 return 0;
2658
2659         return -EACCES;
2660 }
2661
2662 /*
2663  * Note: On error, nfs4_proc_open will free the struct nfs4_opendata
2664  */
2665 static int _nfs4_proc_open(struct nfs4_opendata *data,
2666                            struct nfs_open_context *ctx)
2667 {
2668         struct inode *dir = d_inode(data->dir);
2669         struct nfs_server *server = NFS_SERVER(dir);
2670         struct nfs_openargs *o_arg = &data->o_arg;
2671         struct nfs_openres *o_res = &data->o_res;
2672         int status;
2673
2674         status = nfs4_run_open_task(data, ctx);
2675         if (!data->rpc_done)
2676                 return status;
2677         if (status != 0) {
2678                 if (status == -NFS4ERR_BADNAME &&
2679                                 !(o_arg->open_flags & O_CREAT))
2680                         return -ENOENT;
2681                 return status;
2682         }
2683
2684         nfs_fattr_map_and_free_names(server, &data->f_attr);
2685
2686         if (o_arg->open_flags & O_CREAT) {
2687                 if (o_arg->open_flags & O_EXCL)
2688                         data->file_created = true;
2689                 else if (o_res->cinfo.before != o_res->cinfo.after)
2690                         data->file_created = true;
2691                 if (data->file_created ||
2692                     inode_peek_iversion_raw(dir) != o_res->cinfo.after)
2693                         nfs4_update_changeattr(dir, &o_res->cinfo,
2694                                         o_res->f_attr->time_start,
2695                                         NFS_INO_INVALID_DATA);
2696         }
2697         if ((o_res->rflags & NFS4_OPEN_RESULT_LOCKTYPE_POSIX) == 0)
2698                 server->caps &= ~NFS_CAP_POSIX_LOCK;
2699         if(o_res->rflags & NFS4_OPEN_RESULT_CONFIRM) {
2700                 status = _nfs4_proc_open_confirm(data);
2701                 if (status != 0)
2702                         return status;
2703         }
2704         if (!(o_res->f_attr->valid & NFS_ATTR_FATTR)) {
2705                 nfs4_sequence_free_slot(&o_res->seq_res);
2706                 nfs4_proc_getattr(server, &o_res->fh, o_res->f_attr, NULL);
2707         }
2708         return 0;
2709 }
2710
2711 /*
2712  * OPEN_EXPIRED:
2713  *      reclaim state on the server after a network partition.
2714  *      Assumes caller holds the appropriate lock
2715  */
2716 static int _nfs4_open_expired(struct nfs_open_context *ctx, struct nfs4_state *state)
2717 {
2718         struct nfs4_opendata *opendata;
2719         int ret;
2720
2721         opendata = nfs4_open_recoverdata_alloc(ctx, state, NFS4_OPEN_CLAIM_FH);
2722         if (IS_ERR(opendata))
2723                 return PTR_ERR(opendata);
2724         /*
2725          * We're not recovering a delegation, so ask for no delegation.
2726          * Otherwise the recovery thread could deadlock with an outstanding
2727          * delegation return.
2728          */
2729         opendata->o_arg.open_flags = O_DIRECT;
2730         ret = nfs4_open_recover(opendata, state);
2731         if (ret == -ESTALE)
2732                 d_drop(ctx->dentry);
2733         nfs4_opendata_put(opendata);
2734         return ret;
2735 }
2736
2737 static int nfs4_do_open_expired(struct nfs_open_context *ctx, struct nfs4_state *state)
2738 {
2739         struct nfs_server *server = NFS_SERVER(state->inode);
2740         struct nfs4_exception exception = { };
2741         int err;
2742
2743         do {
2744                 err = _nfs4_open_expired(ctx, state);
2745                 trace_nfs4_open_expired(ctx, 0, err);
2746                 if (nfs4_clear_cap_atomic_open_v1(server, err, &exception))
2747                         continue;
2748                 switch (err) {
2749                 default:
2750                         goto out;
2751                 case -NFS4ERR_GRACE:
2752                 case -NFS4ERR_DELAY:
2753                         nfs4_handle_exception(server, err, &exception);
2754                         err = 0;
2755                 }
2756         } while (exception.retry);
2757 out:
2758         return err;
2759 }
2760
2761 static int nfs4_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state)
2762 {
2763         struct nfs_open_context *ctx;
2764         int ret;
2765
2766         ctx = nfs4_state_find_open_context(state);
2767         if (IS_ERR(ctx))
2768                 return -EAGAIN;
2769         ret = nfs4_do_open_expired(ctx, state);
2770         put_nfs_open_context(ctx);
2771         return ret;
2772 }
2773
2774 static void nfs_finish_clear_delegation_stateid(struct nfs4_state *state,
2775                 const nfs4_stateid *stateid)
2776 {
2777         nfs_remove_bad_delegation(state->inode, stateid);
2778         nfs_state_clear_delegation(state);
2779 }
2780
2781 static void nfs40_clear_delegation_stateid(struct nfs4_state *state)
2782 {
2783         if (rcu_access_pointer(NFS_I(state->inode)->delegation) != NULL)
2784                 nfs_finish_clear_delegation_stateid(state, NULL);
2785 }
2786
2787 static int nfs40_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state)
2788 {
2789         /* NFSv4.0 doesn't allow for delegation recovery on open expire */
2790         nfs40_clear_delegation_stateid(state);
2791         nfs_state_clear_open_state_flags(state);
2792         return nfs4_open_expired(sp, state);
2793 }
2794
2795 static int nfs40_test_and_free_expired_stateid(struct nfs_server *server,
2796                 nfs4_stateid *stateid,
2797                 const struct cred *cred)
2798 {
2799         return -NFS4ERR_BAD_STATEID;
2800 }
2801
2802 #if defined(CONFIG_NFS_V4_1)
2803 static int nfs41_test_and_free_expired_stateid(struct nfs_server *server,
2804                 nfs4_stateid *stateid,
2805                 const struct cred *cred)
2806 {
2807         int status;
2808
2809         switch (stateid->type) {
2810         default:
2811                 break;
2812         case NFS4_INVALID_STATEID_TYPE:
2813         case NFS4_SPECIAL_STATEID_TYPE:
2814                 return -NFS4ERR_BAD_STATEID;
2815         case NFS4_REVOKED_STATEID_TYPE:
2816                 goto out_free;
2817         }
2818
2819         status = nfs41_test_stateid(server, stateid, cred);
2820         switch (status) {
2821         case -NFS4ERR_EXPIRED:
2822         case -NFS4ERR_ADMIN_REVOKED:
2823         case -NFS4ERR_DELEG_REVOKED:
2824                 break;
2825         default:
2826                 return status;
2827         }
2828 out_free:
2829         /* Ack the revoked state to the server */
2830         nfs41_free_stateid(server, stateid, cred, true);
2831         return -NFS4ERR_EXPIRED;
2832 }
2833
2834 static int nfs41_check_delegation_stateid(struct nfs4_state *state)
2835 {
2836         struct nfs_server *server = NFS_SERVER(state->inode);
2837         nfs4_stateid stateid;
2838         struct nfs_delegation *delegation;
2839         const struct cred *cred = NULL;
2840         int status, ret = NFS_OK;
2841
2842         /* Get the delegation credential for use by test/free_stateid */
2843         rcu_read_lock();
2844         delegation = rcu_dereference(NFS_I(state->inode)->delegation);
2845         if (delegation == NULL) {
2846                 rcu_read_unlock();
2847                 nfs_state_clear_delegation(state);
2848                 return NFS_OK;
2849         }
2850
2851         spin_lock(&delegation->lock);
2852         nfs4_stateid_copy(&stateid, &delegation->stateid);
2853
2854         if (!test_and_clear_bit(NFS_DELEGATION_TEST_EXPIRED,
2855                                 &delegation->flags)) {
2856                 spin_unlock(&delegation->lock);
2857                 rcu_read_unlock();
2858                 return NFS_OK;
2859         }
2860
2861         if (delegation->cred)
2862                 cred = get_cred(delegation->cred);
2863         spin_unlock(&delegation->lock);
2864         rcu_read_unlock();
2865         status = nfs41_test_and_free_expired_stateid(server, &stateid, cred);
2866         trace_nfs4_test_delegation_stateid(state, NULL, status);
2867         if (status == -NFS4ERR_EXPIRED || status == -NFS4ERR_BAD_STATEID)
2868                 nfs_finish_clear_delegation_stateid(state, &stateid);
2869         else
2870                 ret = status;
2871
2872         put_cred(cred);
2873         return ret;
2874 }
2875
2876 static void nfs41_delegation_recover_stateid(struct nfs4_state *state)
2877 {
2878         nfs4_stateid tmp;
2879
2880         if (test_bit(NFS_DELEGATED_STATE, &state->flags) &&
2881             nfs4_copy_delegation_stateid(state->inode, state->state,
2882                                 &tmp, NULL) &&
2883             nfs4_stateid_match_other(&state->stateid, &tmp))
2884                 nfs_state_set_delegation(state, &tmp, state->state);
2885         else
2886                 nfs_state_clear_delegation(state);
2887 }
2888
2889 /**
2890  * nfs41_check_expired_locks - possibly free a lock stateid
2891  *
2892  * @state: NFSv4 state for an inode
2893  *
2894  * Returns NFS_OK if recovery for this stateid is now finished.
2895  * Otherwise a negative NFS4ERR value is returned.
2896  */
2897 static int nfs41_check_expired_locks(struct nfs4_state *state)
2898 {
2899         int status, ret = NFS_OK;
2900         struct nfs4_lock_state *lsp, *prev = NULL;
2901         struct nfs_server *server = NFS_SERVER(state->inode);
2902
2903         if (!test_bit(LK_STATE_IN_USE, &state->flags))
2904                 goto out;
2905
2906         spin_lock(&state->state_lock);
2907         list_for_each_entry(lsp, &state->lock_states, ls_locks) {
2908                 if (test_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags)) {
2909                         const struct cred *cred = lsp->ls_state->owner->so_cred;
2910
2911                         refcount_inc(&lsp->ls_count);
2912                         spin_unlock(&state->state_lock);
2913
2914                         nfs4_put_lock_state(prev);
2915                         prev = lsp;
2916
2917                         status = nfs41_test_and_free_expired_stateid(server,
2918                                         &lsp->ls_stateid,
2919                                         cred);
2920                         trace_nfs4_test_lock_stateid(state, lsp, status);
2921                         if (status == -NFS4ERR_EXPIRED ||
2922                             status == -NFS4ERR_BAD_STATEID) {
2923                                 clear_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags);
2924                                 lsp->ls_stateid.type = NFS4_INVALID_STATEID_TYPE;
2925                                 if (!recover_lost_locks)
2926                                         set_bit(NFS_LOCK_LOST, &lsp->ls_flags);
2927                         } else if (status != NFS_OK) {
2928                                 ret = status;
2929                                 nfs4_put_lock_state(prev);
2930                                 goto out;
2931                         }
2932                         spin_lock(&state->state_lock);
2933                 }
2934         }
2935         spin_unlock(&state->state_lock);
2936         nfs4_put_lock_state(prev);
2937 out:
2938         return ret;
2939 }
2940
2941 /**
2942  * nfs41_check_open_stateid - possibly free an open stateid
2943  *
2944  * @state: NFSv4 state for an inode
2945  *
2946  * Returns NFS_OK if recovery for this stateid is now finished.
2947  * Otherwise a negative NFS4ERR value is returned.
2948  */
2949 static int nfs41_check_open_stateid(struct nfs4_state *state)
2950 {
2951         struct nfs_server *server = NFS_SERVER(state->inode);
2952         nfs4_stateid *stateid = &state->open_stateid;
2953         const struct cred *cred = state->owner->so_cred;
2954         int status;
2955
2956         if (test_bit(NFS_OPEN_STATE, &state->flags) == 0)
2957                 return -NFS4ERR_BAD_STATEID;
2958         status = nfs41_test_and_free_expired_stateid(server, stateid, cred);
2959         trace_nfs4_test_open_stateid(state, NULL, status);
2960         if (status == -NFS4ERR_EXPIRED || status == -NFS4ERR_BAD_STATEID) {
2961                 nfs_state_clear_open_state_flags(state);
2962                 stateid->type = NFS4_INVALID_STATEID_TYPE;
2963                 return status;
2964         }
2965         if (nfs_open_stateid_recover_openmode(state))
2966                 return -NFS4ERR_OPENMODE;
2967         return NFS_OK;
2968 }
2969
2970 static int nfs41_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state)
2971 {
2972         int status;
2973
2974         status = nfs41_check_delegation_stateid(state);
2975         if (status != NFS_OK)
2976                 return status;
2977         nfs41_delegation_recover_stateid(state);
2978
2979         status = nfs41_check_expired_locks(state);
2980         if (status != NFS_OK)
2981                 return status;
2982         status = nfs41_check_open_stateid(state);
2983         if (status != NFS_OK)
2984                 status = nfs4_open_expired(sp, state);
2985         return status;
2986 }
2987 #endif
2988
2989 /*
2990  * on an EXCLUSIVE create, the server should send back a bitmask with FATTR4-*
2991  * fields corresponding to attributes that were used to store the verifier.
2992  * Make sure we clobber those fields in the later setattr call
2993  */
2994 static unsigned nfs4_exclusive_attrset(struct nfs4_opendata *opendata,
2995                                 struct iattr *sattr, struct nfs4_label **label)
2996 {
2997         const __u32 *bitmask = opendata->o_arg.server->exclcreat_bitmask;
2998         __u32 attrset[3];
2999         unsigned ret;
3000         unsigned i;
3001
3002         for (i = 0; i < ARRAY_SIZE(attrset); i++) {
3003                 attrset[i] = opendata->o_res.attrset[i];
3004                 if (opendata->o_arg.createmode == NFS4_CREATE_EXCLUSIVE4_1)
3005                         attrset[i] &= ~bitmask[i];
3006         }
3007
3008         ret = (opendata->o_arg.createmode == NFS4_CREATE_EXCLUSIVE) ?
3009                 sattr->ia_valid : 0;
3010
3011         if ((attrset[1] & (FATTR4_WORD1_TIME_ACCESS|FATTR4_WORD1_TIME_ACCESS_SET))) {
3012                 if (sattr->ia_valid & ATTR_ATIME_SET)
3013                         ret |= ATTR_ATIME_SET;
3014                 else
3015                         ret |= ATTR_ATIME;
3016         }
3017
3018         if ((attrset[1] & (FATTR4_WORD1_TIME_MODIFY|FATTR4_WORD1_TIME_MODIFY_SET))) {
3019                 if (sattr->ia_valid & ATTR_MTIME_SET)
3020                         ret |= ATTR_MTIME_SET;
3021                 else
3022                         ret |= ATTR_MTIME;
3023         }
3024
3025         if (!(attrset[2] & FATTR4_WORD2_SECURITY_LABEL))
3026                 *label = NULL;
3027         return ret;
3028 }
3029
3030 static int _nfs4_open_and_get_state(struct nfs4_opendata *opendata,
3031                 struct nfs_open_context *ctx)
3032 {
3033         struct nfs4_state_owner *sp = opendata->owner;
3034         struct nfs_server *server = sp->so_server;
3035         struct dentry *dentry;
3036         struct nfs4_state *state;
3037         fmode_t acc_mode = _nfs4_ctx_to_accessmode(ctx);
3038         struct inode *dir = d_inode(opendata->dir);
3039         unsigned long dir_verifier;
3040         unsigned int seq;
3041         int ret;
3042
3043         seq = raw_seqcount_begin(&sp->so_reclaim_seqcount);
3044         dir_verifier = nfs_save_change_attribute(dir);
3045
3046         ret = _nfs4_proc_open(opendata, ctx);
3047         if (ret != 0)
3048                 goto out;
3049
3050         state = _nfs4_opendata_to_nfs4_state(opendata);
3051         ret = PTR_ERR(state);
3052         if (IS_ERR(state))
3053                 goto out;
3054         ctx->state = state;
3055         if (server->caps & NFS_CAP_POSIX_LOCK)
3056                 set_bit(NFS_STATE_POSIX_LOCKS, &state->flags);
3057         if (opendata->o_res.rflags & NFS4_OPEN_RESULT_MAY_NOTIFY_LOCK)
3058                 set_bit(NFS_STATE_MAY_NOTIFY_LOCK, &state->flags);
3059         if (opendata->o_res.rflags & NFS4_OPEN_RESULT_PRESERVE_UNLINKED)
3060                 set_bit(NFS_INO_PRESERVE_UNLINKED, &NFS_I(state->inode)->flags);
3061
3062         dentry = opendata->dentry;
3063         if (d_really_is_negative(dentry)) {
3064                 struct dentry *alias;
3065                 d_drop(dentry);
3066                 alias = d_exact_alias(dentry, state->inode);
3067                 if (!alias)
3068                         alias = d_splice_alias(igrab(state->inode), dentry);
3069                 /* d_splice_alias() can't fail here - it's a non-directory */
3070                 if (alias) {
3071                         dput(ctx->dentry);
3072                         ctx->dentry = dentry = alias;
3073                 }
3074         }
3075
3076         switch(opendata->o_arg.claim) {
3077         default:
3078                 break;
3079         case NFS4_OPEN_CLAIM_NULL:
3080         case NFS4_OPEN_CLAIM_DELEGATE_CUR:
3081         case NFS4_OPEN_CLAIM_DELEGATE_PREV:
3082                 if (!opendata->rpc_done)
3083                         break;
3084                 if (opendata->o_res.delegation_type != 0)
3085                         dir_verifier = nfs_save_change_attribute(dir);
3086                 nfs_set_verifier(dentry, dir_verifier);
3087         }
3088
3089         /* Parse layoutget results before we check for access */
3090         pnfs_parse_lgopen(state->inode, opendata->lgp, ctx);
3091
3092         ret = nfs4_opendata_access(sp->so_cred, opendata, state, acc_mode);
3093         if (ret != 0)
3094                 goto out;
3095
3096         if (d_inode(dentry) == state->inode) {
3097                 nfs_inode_attach_open_context(ctx);
3098                 if (read_seqcount_retry(&sp->so_reclaim_seqcount, seq))
3099                         nfs4_schedule_stateid_recovery(server, state);
3100         }
3101
3102 out:
3103         if (!opendata->cancelled) {
3104                 if (opendata->lgp) {
3105                         nfs4_lgopen_release(opendata->lgp);
3106                         opendata->lgp = NULL;
3107                 }
3108                 nfs4_sequence_free_slot(&opendata->o_res.seq_res);
3109         }
3110         return ret;
3111 }
3112
3113 /*
3114  * Returns a referenced nfs4_state
3115  */
3116 static int _nfs4_do_open(struct inode *dir,
3117                         struct nfs_open_context *ctx,
3118                         int flags,
3119                         const struct nfs4_open_createattrs *c,
3120                         int *opened)
3121 {
3122         struct nfs4_state_owner  *sp;
3123         struct nfs4_state     *state = NULL;
3124         struct nfs_server       *server = NFS_SERVER(dir);
3125         struct nfs4_opendata *opendata;
3126         struct dentry *dentry = ctx->dentry;
3127         const struct cred *cred = ctx->cred;
3128         struct nfs4_threshold **ctx_th = &ctx->mdsthreshold;
3129         fmode_t fmode = _nfs4_ctx_to_openmode(ctx);
3130         enum open_claim_type4 claim = NFS4_OPEN_CLAIM_NULL;
3131         struct iattr *sattr = c->sattr;
3132         struct nfs4_label *label = c->label;
3133         int status;
3134
3135         /* Protect against reboot recovery conflicts */
3136         status = -ENOMEM;
3137         sp = nfs4_get_state_owner(server, cred, GFP_KERNEL);
3138         if (sp == NULL) {
3139                 dprintk("nfs4_do_open: nfs4_get_state_owner failed!\n");
3140                 goto out_err;
3141         }
3142         status = nfs4_client_recover_expired_lease(server->nfs_client);
3143         if (status != 0)
3144                 goto err_put_state_owner;
3145         if (d_really_is_positive(dentry))
3146                 nfs4_return_incompatible_delegation(d_inode(dentry), fmode);
3147         status = -ENOMEM;
3148         if (d_really_is_positive(dentry))
3149                 claim = NFS4_OPEN_CLAIM_FH;
3150         opendata = nfs4_opendata_alloc(dentry, sp, fmode, flags,
3151                         c, claim, GFP_KERNEL);
3152         if (opendata == NULL)
3153                 goto err_put_state_owner;
3154
3155         if (server->attr_bitmask[2] & FATTR4_WORD2_MDSTHRESHOLD) {
3156                 if (!opendata->f_attr.mdsthreshold) {
3157                         opendata->f_attr.mdsthreshold = pnfs_mdsthreshold_alloc();
3158                         if (!opendata->f_attr.mdsthreshold)
3159                                 goto err_opendata_put;
3160                 }
3161                 opendata->o_arg.open_bitmap = &nfs4_pnfs_open_bitmap[0];
3162         }
3163         if (d_really_is_positive(dentry))
3164                 opendata->state = nfs4_get_open_state(d_inode(dentry), sp);
3165
3166         status = _nfs4_open_and_get_state(opendata, ctx);
3167         if (status != 0)
3168                 goto err_opendata_put;
3169         state = ctx->state;
3170
3171         if ((opendata->o_arg.open_flags & (O_CREAT|O_EXCL)) == (O_CREAT|O_EXCL) &&
3172             (opendata->o_arg.createmode != NFS4_CREATE_GUARDED)) {
3173                 unsigned attrs = nfs4_exclusive_attrset(opendata, sattr, &label);
3174                 /*
3175                  * send create attributes which was not set by open
3176                  * with an extra setattr.
3177                  */
3178                 if (attrs || label) {
3179                         unsigned ia_old = sattr->ia_valid;
3180
3181                         sattr->ia_valid = attrs;
3182                         nfs_fattr_init(opendata->o_res.f_attr);
3183                         status = nfs4_do_setattr(state->inode, cred,
3184                                         opendata->o_res.f_attr, sattr,
3185                                         ctx, label);
3186                         if (status == 0) {
3187                                 nfs_setattr_update_inode(state->inode, sattr,
3188                                                 opendata->o_res.f_attr);
3189                                 nfs_setsecurity(state->inode, opendata->o_res.f_attr);
3190                         }
3191                         sattr->ia_valid = ia_old;
3192                 }
3193         }
3194         if (opened && opendata->file_created)
3195                 *opened = 1;
3196
3197         if (pnfs_use_threshold(ctx_th, opendata->f_attr.mdsthreshold, server)) {
3198                 *ctx_th = opendata->f_attr.mdsthreshold;
3199                 opendata->f_attr.mdsthreshold = NULL;
3200         }
3201
3202         nfs4_opendata_put(opendata);
3203         nfs4_put_state_owner(sp);
3204         return 0;
3205 err_opendata_put:
3206         nfs4_opendata_put(opendata);
3207 err_put_state_owner:
3208         nfs4_put_state_owner(sp);
3209 out_err:
3210         return status;
3211 }
3212
3213
3214 static struct nfs4_state *nfs4_do_open(struct inode *dir,
3215                                         struct nfs_open_context *ctx,
3216                                         int flags,
3217                                         struct iattr *sattr,
3218                                         struct nfs4_label *label,
3219                                         int *opened)
3220 {
3221         struct nfs_server *server = NFS_SERVER(dir);
3222         struct nfs4_exception exception = {
3223                 .interruptible = true,
3224         };
3225         struct nfs4_state *res;
3226         struct nfs4_open_createattrs c = {
3227                 .label = label,
3228                 .sattr = sattr,
3229                 .verf = {
3230                         [0] = (__u32)jiffies,
3231                         [1] = (__u32)current->pid,
3232                 },
3233         };
3234         int status;
3235
3236         do {
3237                 status = _nfs4_do_open(dir, ctx, flags, &c, opened);
3238                 res = ctx->state;
3239                 trace_nfs4_open_file(ctx, flags, status);
3240                 if (status == 0)
3241                         break;
3242                 /* NOTE: BAD_SEQID means the server and client disagree about the
3243                  * book-keeping w.r.t. state-changing operations
3244                  * (OPEN/CLOSE/LOCK/LOCKU...)
3245                  * It is actually a sign of a bug on the client or on the server.
3246                  *
3247                  * If we receive a BAD_SEQID error in the particular case of
3248                  * doing an OPEN, we assume that nfs_increment_open_seqid() will
3249                  * have unhashed the old state_owner for us, and that we can
3250                  * therefore safely retry using a new one. We should still warn
3251                  * the user though...
3252                  */
3253                 if (status == -NFS4ERR_BAD_SEQID) {
3254                         pr_warn_ratelimited("NFS: v4 server %s "
3255                                         " returned a bad sequence-id error!\n",
3256                                         NFS_SERVER(dir)->nfs_client->cl_hostname);
3257                         exception.retry = 1;
3258                         continue;
3259                 }
3260                 /*
3261                  * BAD_STATEID on OPEN means that the server cancelled our
3262                  * state before it received the OPEN_CONFIRM.
3263                  * Recover by retrying the request as per the discussion
3264                  * on Page 181 of RFC3530.
3265                  */
3266                 if (status == -NFS4ERR_BAD_STATEID) {
3267                         exception.retry = 1;
3268                         continue;
3269                 }
3270                 if (status == -NFS4ERR_EXPIRED) {
3271                         nfs4_schedule_lease_recovery(server->nfs_client);
3272                         exception.retry = 1;
3273                         continue;
3274                 }
3275                 if (status == -EAGAIN) {
3276                         /* We must have found a delegation */
3277                         exception.retry = 1;
3278                         continue;
3279                 }
3280                 if (nfs4_clear_cap_atomic_open_v1(server, status, &exception))
3281                         continue;
3282                 res = ERR_PTR(nfs4_handle_exception(server,
3283                                         status, &exception));
3284         } while (exception.retry);
3285         return res;
3286 }
3287
3288 static int _nfs4_do_setattr(struct inode *inode,
3289                             struct nfs_setattrargs *arg,
3290                             struct nfs_setattrres *res,
3291                             const struct cred *cred,
3292                             struct nfs_open_context *ctx)
3293 {
3294         struct nfs_server *server = NFS_SERVER(inode);
3295         struct rpc_message msg = {
3296                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_SETATTR],
3297                 .rpc_argp       = arg,
3298                 .rpc_resp       = res,
3299                 .rpc_cred       = cred,
3300         };
3301         const struct cred *delegation_cred = NULL;
3302         unsigned long timestamp = jiffies;
3303         bool truncate;
3304         int status;
3305
3306         nfs_fattr_init(res->fattr);
3307
3308         /* Servers should only apply open mode checks for file size changes */
3309         truncate = (arg->iap->ia_valid & ATTR_SIZE) ? true : false;
3310         if (!truncate) {
3311                 nfs4_inode_make_writeable(inode);
3312                 goto zero_stateid;
3313         }
3314
3315         if (nfs4_copy_delegation_stateid(inode, FMODE_WRITE, &arg->stateid, &delegation_cred)) {
3316                 /* Use that stateid */
3317         } else if (ctx != NULL && ctx->state) {
3318                 struct nfs_lock_context *l_ctx;
3319                 if (!nfs4_valid_open_stateid(ctx->state))
3320                         return -EBADF;
3321                 l_ctx = nfs_get_lock_context(ctx);
3322                 if (IS_ERR(l_ctx))
3323                         return PTR_ERR(l_ctx);
3324                 status = nfs4_select_rw_stateid(ctx->state, FMODE_WRITE, l_ctx,
3325                                                 &arg->stateid, &delegation_cred);
3326                 nfs_put_lock_context(l_ctx);
3327                 if (status == -EIO)
3328                         return -EBADF;
3329                 else if (status == -EAGAIN)
3330                         goto zero_stateid;
3331         } else {
3332 zero_stateid:
3333                 nfs4_stateid_copy(&arg->stateid, &zero_stateid);
3334         }
3335         if (delegation_cred)
3336                 msg.rpc_cred = delegation_cred;
3337
3338         status = nfs4_call_sync(server->client, server, &msg, &arg->seq_args, &res->seq_res, 1);
3339
3340         put_cred(delegation_cred);
3341         if (status == 0 && ctx != NULL)
3342                 renew_lease(server, timestamp);
3343         trace_nfs4_setattr(inode, &arg->stateid, status);
3344         return status;
3345 }
3346
3347 static int nfs4_do_setattr(struct inode *inode, const struct cred *cred,
3348                            struct nfs_fattr *fattr, struct iattr *sattr,
3349                            struct nfs_open_context *ctx, struct nfs4_label *ilabel)
3350 {
3351         struct nfs_server *server = NFS_SERVER(inode);
3352         __u32 bitmask[NFS4_BITMASK_SZ];
3353         struct nfs4_state *state = ctx ? ctx->state : NULL;
3354         struct nfs_setattrargs  arg = {
3355                 .fh             = NFS_FH(inode),
3356                 .iap            = sattr,
3357                 .server         = server,
3358                 .bitmask = bitmask,
3359                 .label          = ilabel,
3360         };
3361         struct nfs_setattrres  res = {
3362                 .fattr          = fattr,
3363                 .server         = server,
3364         };
3365         struct nfs4_exception exception = {
3366                 .state = state,
3367                 .inode = inode,
3368                 .stateid = &arg.stateid,
3369         };
3370         unsigned long adjust_flags = NFS_INO_INVALID_CHANGE;
3371         int err;
3372
3373         if (sattr->ia_valid & (ATTR_MODE | ATTR_KILL_SUID | ATTR_KILL_SGID))
3374                 adjust_flags |= NFS_INO_INVALID_MODE;
3375         if (sattr->ia_valid & (ATTR_UID | ATTR_GID))
3376                 adjust_flags |= NFS_INO_INVALID_OTHER;
3377
3378         do {
3379                 nfs4_bitmap_copy_adjust(bitmask, nfs4_bitmask(server, fattr->label),
3380                                         inode, adjust_flags);
3381
3382                 err = _nfs4_do_setattr(inode, &arg, &res, cred, ctx);
3383                 switch (err) {
3384                 case -NFS4ERR_OPENMODE:
3385                         if (!(sattr->ia_valid & ATTR_SIZE)) {
3386                                 pr_warn_once("NFSv4: server %s is incorrectly "
3387                                                 "applying open mode checks to "
3388                                                 "a SETATTR that is not "
3389                                                 "changing file size.\n",
3390                                                 server->nfs_client->cl_hostname);
3391                         }
3392                         if (state && !(state->state & FMODE_WRITE)) {
3393                                 err = -EBADF;
3394                                 if (sattr->ia_valid & ATTR_OPEN)
3395                                         err = -EACCES;
3396                                 goto out;
3397                         }
3398                 }
3399                 err = nfs4_handle_exception(server, err, &exception);
3400         } while (exception.retry);
3401 out:
3402         return err;
3403 }
3404
3405 static bool
3406 nfs4_wait_on_layoutreturn(struct inode *inode, struct rpc_task *task)
3407 {
3408         if (inode == NULL || !nfs_have_layout(inode))
3409                 return false;
3410
3411         return pnfs_wait_on_layoutreturn(inode, task);
3412 }
3413
3414 /*
3415  * Update the seqid of an open stateid
3416  */
3417 static void nfs4_sync_open_stateid(nfs4_stateid *dst,
3418                 struct nfs4_state *state)
3419 {
3420         __be32 seqid_open;
3421         u32 dst_seqid;
3422         int seq;
3423
3424         for (;;) {
3425                 if (!nfs4_valid_open_stateid(state))
3426                         break;
3427                 seq = read_seqbegin(&state->seqlock);
3428                 if (!nfs4_state_match_open_stateid_other(state, dst)) {
3429                         nfs4_stateid_copy(dst, &state->open_stateid);
3430                         if (read_seqretry(&state->seqlock, seq))
3431                                 continue;
3432                         break;
3433                 }
3434                 seqid_open = state->open_stateid.seqid;
3435                 if (read_seqretry(&state->seqlock, seq))
3436                         continue;
3437
3438                 dst_seqid = be32_to_cpu(dst->seqid);
3439                 if ((s32)(dst_seqid - be32_to_cpu(seqid_open)) < 0)
3440                         dst->seqid = seqid_open;
3441                 break;
3442         }
3443 }
3444
3445 /*
3446  * Update the seqid of an open stateid after receiving
3447  * NFS4ERR_OLD_STATEID
3448  */
3449 static bool nfs4_refresh_open_old_stateid(nfs4_stateid *dst,
3450                 struct nfs4_state *state)
3451 {
3452         __be32 seqid_open;
3453         u32 dst_seqid;
3454         bool ret;
3455         int seq, status = -EAGAIN;
3456         DEFINE_WAIT(wait);
3457
3458         for (;;) {
3459                 ret = false;
3460                 if (!nfs4_valid_open_stateid(state))
3461                         break;
3462                 seq = read_seqbegin(&state->seqlock);
3463                 if (!nfs4_state_match_open_stateid_other(state, dst)) {
3464                         if (read_seqretry(&state->seqlock, seq))
3465                                 continue;
3466                         break;
3467                 }
3468
3469                 write_seqlock(&state->seqlock);
3470                 seqid_open = state->open_stateid.seqid;
3471
3472                 dst_seqid = be32_to_cpu(dst->seqid);
3473
3474                 /* Did another OPEN bump the state's seqid?  try again: */
3475                 if ((s32)(be32_to_cpu(seqid_open) - dst_seqid) > 0) {
3476                         dst->seqid = seqid_open;
3477                         write_sequnlock(&state->seqlock);
3478                         ret = true;
3479                         break;
3480                 }
3481
3482                 /* server says we're behind but we haven't seen the update yet */
3483                 set_bit(NFS_STATE_CHANGE_WAIT, &state->flags);
3484                 prepare_to_wait(&state->waitq, &wait, TASK_KILLABLE);
3485                 write_sequnlock(&state->seqlock);
3486                 trace_nfs4_close_stateid_update_wait(state->inode, dst, 0);
3487
3488                 if (fatal_signal_pending(current))
3489                         status = -EINTR;
3490                 else
3491                         if (schedule_timeout(5*HZ) != 0)
3492                                 status = 0;
3493
3494                 finish_wait(&state->waitq, &wait);
3495
3496                 if (!status)
3497                         continue;
3498                 if (status == -EINTR)
3499                         break;
3500
3501                 /* we slept the whole 5 seconds, we must have lost a seqid */
3502                 dst->seqid = cpu_to_be32(dst_seqid + 1);
3503                 ret = true;
3504                 break;
3505         }
3506
3507         return ret;
3508 }
3509
3510 struct nfs4_closedata {
3511         struct inode *inode;
3512         struct nfs4_state *state;
3513         struct nfs_closeargs arg;
3514         struct nfs_closeres res;
3515         struct {
3516                 struct nfs4_layoutreturn_args arg;
3517                 struct nfs4_layoutreturn_res res;
3518                 struct nfs4_xdr_opaque_data ld_private;
3519                 u32 roc_barrier;
3520                 bool roc;
3521         } lr;
3522         struct nfs_fattr fattr;
3523         unsigned long timestamp;
3524 };
3525
3526 static void nfs4_free_closedata(void *data)
3527 {
3528         struct nfs4_closedata *calldata = data;
3529         struct nfs4_state_owner *sp = calldata->state->owner;
3530         struct super_block *sb = calldata->state->inode->i_sb;
3531
3532         if (calldata->lr.roc)
3533                 pnfs_roc_release(&calldata->lr.arg, &calldata->lr.res,
3534                                 calldata->res.lr_ret);
3535         nfs4_put_open_state(calldata->state);
3536         nfs_free_seqid(calldata->arg.seqid);
3537         nfs4_put_state_owner(sp);
3538         nfs_sb_deactive(sb);
3539         kfree(calldata);
3540 }
3541
3542 static void nfs4_close_done(struct rpc_task *task, void *data)
3543 {
3544         struct nfs4_closedata *calldata = data;
3545         struct nfs4_state *state = calldata->state;
3546         struct nfs_server *server = NFS_SERVER(calldata->inode);
3547         nfs4_stateid *res_stateid = NULL;
3548         struct nfs4_exception exception = {
3549                 .state = state,
3550                 .inode = calldata->inode,
3551                 .stateid = &calldata->arg.stateid,
3552         };
3553
3554         if (!nfs4_sequence_done(task, &calldata->res.seq_res))
3555                 return;
3556         trace_nfs4_close(state, &calldata->arg, &calldata->res, task->tk_status);
3557
3558         /* Handle Layoutreturn errors */
3559         if (pnfs_roc_done(task, &calldata->arg.lr_args, &calldata->res.lr_res,
3560                           &calldata->res.lr_ret) == -EAGAIN)
3561                 goto out_restart;
3562
3563         /* hmm. we are done with the inode, and in the process of freeing
3564          * the state_owner. we keep this around to process errors
3565          */
3566         switch (task->tk_status) {
3567                 case 0:
3568                         res_stateid = &calldata->res.stateid;
3569                         renew_lease(server, calldata->timestamp);
3570                         break;
3571                 case -NFS4ERR_ACCESS:
3572                         if (calldata->arg.bitmask != NULL) {
3573                                 calldata->arg.bitmask = NULL;
3574                                 calldata->res.fattr = NULL;
3575                                 goto out_restart;
3576
3577                         }
3578                         break;
3579                 case -NFS4ERR_OLD_STATEID:
3580                         /* Did we race with OPEN? */
3581                         if (nfs4_refresh_open_old_stateid(&calldata->arg.stateid,
3582                                                 state))
3583                                 goto out_restart;
3584                         goto out_release;
3585                 case -NFS4ERR_ADMIN_REVOKED:
3586                 case -NFS4ERR_STALE_STATEID:
3587                 case -NFS4ERR_EXPIRED:
3588                         nfs4_free_revoked_stateid(server,
3589                                         &calldata->arg.stateid,
3590                                         task->tk_msg.rpc_cred);
3591                         fallthrough;
3592                 case -NFS4ERR_BAD_STATEID:
3593                         if (calldata->arg.fmode == 0)
3594                                 break;
3595                         fallthrough;
3596                 default:
3597                         task->tk_status = nfs4_async_handle_exception(task,
3598                                         server, task->tk_status, &exception);
3599                         if (exception.retry)
3600                                 goto out_restart;
3601         }
3602         nfs_clear_open_stateid(state, &calldata->arg.stateid,
3603                         res_stateid, calldata->arg.fmode);
3604 out_release:
3605         task->tk_status = 0;
3606         nfs_release_seqid(calldata->arg.seqid);
3607         nfs_refresh_inode(calldata->inode, &calldata->fattr);
3608         dprintk("%s: ret = %d\n", __func__, task->tk_status);
3609         return;
3610 out_restart:
3611         task->tk_status = 0;
3612         rpc_restart_call_prepare(task);
3613         goto out_release;
3614 }
3615
3616 static void nfs4_close_prepare(struct rpc_task *task, void *data)
3617 {
3618         struct nfs4_closedata *calldata = data;
3619         struct nfs4_state *state = calldata->state;
3620         struct inode *inode = calldata->inode;
3621         struct nfs_server *server = NFS_SERVER(inode);
3622         struct pnfs_layout_hdr *lo;
3623         bool is_rdonly, is_wronly, is_rdwr;
3624         int call_close = 0;
3625
3626         if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0)
3627                 goto out_wait;
3628
3629         task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_DOWNGRADE];
3630         spin_lock(&state->owner->so_lock);
3631         is_rdwr = test_bit(NFS_O_RDWR_STATE, &state->flags);
3632         is_rdonly = test_bit(NFS_O_RDONLY_STATE, &state->flags);
3633         is_wronly = test_bit(NFS_O_WRONLY_STATE, &state->flags);
3634         /* Calculate the change in open mode */
3635         calldata->arg.fmode = 0;
3636         if (state->n_rdwr == 0) {
3637                 if (state->n_rdonly == 0)
3638                         call_close |= is_rdonly;
3639                 else if (is_rdonly)
3640                         calldata->arg.fmode |= FMODE_READ;
3641                 if (state->n_wronly == 0)
3642                         call_close |= is_wronly;
3643                 else if (is_wronly)
3644                         calldata->arg.fmode |= FMODE_WRITE;
3645                 if (calldata->arg.fmode != (FMODE_READ|FMODE_WRITE))
3646                         call_close |= is_rdwr;
3647         } else if (is_rdwr)
3648                 calldata->arg.fmode |= FMODE_READ|FMODE_WRITE;
3649
3650         nfs4_sync_open_stateid(&calldata->arg.stateid, state);
3651         if (!nfs4_valid_open_stateid(state))
3652                 call_close = 0;
3653         spin_unlock(&state->owner->so_lock);
3654
3655         if (!call_close) {
3656                 /* Note: exit _without_ calling nfs4_close_done */
3657                 goto out_no_action;
3658         }
3659
3660         if (!calldata->lr.roc && nfs4_wait_on_layoutreturn(inode, task)) {
3661                 nfs_release_seqid(calldata->arg.seqid);
3662                 goto out_wait;
3663         }
3664
3665         lo = calldata->arg.lr_args ? calldata->arg.lr_args->layout : NULL;
3666         if (lo && !pnfs_layout_is_valid(lo)) {
3667                 calldata->arg.lr_args = NULL;
3668                 calldata->res.lr_res = NULL;
3669         }
3670
3671         if (calldata->arg.fmode == 0)
3672                 task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CLOSE];
3673
3674         if (calldata->arg.fmode == 0 || calldata->arg.fmode == FMODE_READ) {
3675                 /* Close-to-open cache consistency revalidation */
3676                 if (!nfs4_have_delegation(inode, FMODE_READ)) {
3677                         nfs4_bitmask_set(calldata->arg.bitmask_store,
3678                                          server->cache_consistency_bitmask,
3679                                          inode, 0);
3680                         calldata->arg.bitmask = calldata->arg.bitmask_store;
3681                 } else
3682                         calldata->arg.bitmask = NULL;
3683         }
3684
3685         calldata->arg.share_access =
3686                 nfs4_map_atomic_open_share(NFS_SERVER(inode),
3687                                 calldata->arg.fmode, 0);
3688
3689         if (calldata->res.fattr == NULL)
3690                 calldata->arg.bitmask = NULL;
3691         else if (calldata->arg.bitmask == NULL)
3692                 calldata->res.fattr = NULL;
3693         calldata->timestamp = jiffies;
3694         if (nfs4_setup_sequence(NFS_SERVER(inode)->nfs_client,
3695                                 &calldata->arg.seq_args,
3696                                 &calldata->res.seq_res,
3697                                 task) != 0)
3698                 nfs_release_seqid(calldata->arg.seqid);
3699         return;
3700 out_no_action:
3701         task->tk_action = NULL;
3702 out_wait:
3703         nfs4_sequence_done(task, &calldata->res.seq_res);
3704 }
3705
3706 static const struct rpc_call_ops nfs4_close_ops = {
3707         .rpc_call_prepare = nfs4_close_prepare,
3708         .rpc_call_done = nfs4_close_done,
3709         .rpc_release = nfs4_free_closedata,
3710 };
3711
3712 /*
3713  * It is possible for data to be read/written from a mem-mapped file
3714  * after the sys_close call (which hits the vfs layer as a flush).
3715  * This means that we can't safely call nfsv4 close on a file until
3716  * the inode is cleared. This in turn means that we are not good
3717  * NFSv4 citizens - we do not indicate to the server to update the file's
3718  * share state even when we are done with one of the three share
3719  * stateid's in the inode.
3720  *
3721  * NOTE: Caller must be holding the sp->so_owner semaphore!
3722  */
3723 int nfs4_do_close(struct nfs4_state *state, gfp_t gfp_mask, int wait)
3724 {
3725         struct nfs_server *server = NFS_SERVER(state->inode);
3726         struct nfs_seqid *(*alloc_seqid)(struct nfs_seqid_counter *, gfp_t);
3727         struct nfs4_closedata *calldata;
3728         struct nfs4_state_owner *sp = state->owner;
3729         struct rpc_task *task;
3730         struct rpc_message msg = {
3731                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CLOSE],
3732                 .rpc_cred = state->owner->so_cred,
3733         };
3734         struct rpc_task_setup task_setup_data = {
3735                 .rpc_client = server->client,
3736                 .rpc_message = &msg,
3737                 .callback_ops = &nfs4_close_ops,
3738                 .workqueue = nfsiod_workqueue,
3739                 .flags = RPC_TASK_ASYNC | RPC_TASK_CRED_NOREF,
3740         };
3741         int status = -ENOMEM;
3742
3743         if (nfs_server_capable(state->inode, NFS_CAP_MOVEABLE))
3744                 task_setup_data.flags |= RPC_TASK_MOVEABLE;
3745
3746         nfs4_state_protect(server->nfs_client, NFS_SP4_MACH_CRED_CLEANUP,
3747                 &task_setup_data.rpc_client, &msg);
3748
3749         calldata = kzalloc(sizeof(*calldata), gfp_mask);
3750         if (calldata == NULL)
3751                 goto out;
3752         nfs4_init_sequence(&calldata->arg.seq_args, &calldata->res.seq_res, 1, 0);
3753         calldata->inode = state->inode;
3754         calldata->state = state;
3755         calldata->arg.fh = NFS_FH(state->inode);
3756         if (!nfs4_copy_open_stateid(&calldata->arg.stateid, state))
3757                 goto out_free_calldata;
3758         /* Serialization for the sequence id */
3759         alloc_seqid = server->nfs_client->cl_mvops->alloc_seqid;
3760         calldata->arg.seqid = alloc_seqid(&state->owner->so_seqid, gfp_mask);
3761         if (IS_ERR(calldata->arg.seqid))
3762                 goto out_free_calldata;
3763         nfs_fattr_init(&calldata->fattr);
3764         calldata->arg.fmode = 0;
3765         calldata->lr.arg.ld_private = &calldata->lr.ld_private;
3766         calldata->res.fattr = &calldata->fattr;
3767         calldata->res.seqid = calldata->arg.seqid;
3768         calldata->res.server = server;
3769         calldata->res.lr_ret = -NFS4ERR_NOMATCHING_LAYOUT;
3770         calldata->lr.roc = pnfs_roc(state->inode,
3771                         &calldata->lr.arg, &calldata->lr.res, msg.rpc_cred);
3772         if (calldata->lr.roc) {
3773                 calldata->arg.lr_args = &calldata->lr.arg;
3774                 calldata->res.lr_res = &calldata->lr.res;
3775         }
3776         nfs_sb_active(calldata->inode->i_sb);
3777
3778         msg.rpc_argp = &calldata->arg;
3779         msg.rpc_resp = &calldata->res;
3780         task_setup_data.callback_data = calldata;
3781         task = rpc_run_task(&task_setup_data);
3782         if (IS_ERR(task))
3783                 return PTR_ERR(task);
3784         status = 0;
3785         if (wait)
3786                 status = rpc_wait_for_completion_task(task);
3787         rpc_put_task(task);
3788         return status;
3789 out_free_calldata:
3790         kfree(calldata);
3791 out:
3792         nfs4_put_open_state(state);
3793         nfs4_put_state_owner(sp);
3794         return status;
3795 }
3796
3797 static struct inode *
3798 nfs4_atomic_open(struct inode *dir, struct nfs_open_context *ctx,
3799                 int open_flags, struct iattr *attr, int *opened)
3800 {
3801         struct nfs4_state *state;
3802         struct nfs4_label l, *label;
3803
3804         label = nfs4_label_init_security(dir, ctx->dentry, attr, &l);
3805
3806         /* Protect against concurrent sillydeletes */
3807         state = nfs4_do_open(dir, ctx, open_flags, attr, label, opened);
3808
3809         nfs4_label_release_security(label);
3810
3811         if (IS_ERR(state))
3812                 return ERR_CAST(state);
3813         return state->inode;
3814 }
3815
3816 static void nfs4_close_context(struct nfs_open_context *ctx, int is_sync)
3817 {
3818         if (ctx->state == NULL)
3819                 return;
3820         if (is_sync)
3821                 nfs4_close_sync(ctx->state, _nfs4_ctx_to_openmode(ctx));
3822         else
3823                 nfs4_close_state(ctx->state, _nfs4_ctx_to_openmode(ctx));
3824 }
3825
3826 #define FATTR4_WORD1_NFS40_MASK (2*FATTR4_WORD1_MOUNTED_ON_FILEID - 1UL)
3827 #define FATTR4_WORD2_NFS41_MASK (2*FATTR4_WORD2_SUPPATTR_EXCLCREAT - 1UL)
3828 #define FATTR4_WORD2_NFS42_MASK (2*FATTR4_WORD2_XATTR_SUPPORT - 1UL)
3829
3830 static int _nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle)
3831 {
3832         u32 bitmask[3] = {}, minorversion = server->nfs_client->cl_minorversion;
3833         struct nfs4_server_caps_arg args = {
3834                 .fhandle = fhandle,
3835                 .bitmask = bitmask,
3836         };
3837         struct nfs4_server_caps_res res = {};
3838         struct rpc_message msg = {
3839                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SERVER_CAPS],
3840                 .rpc_argp = &args,
3841                 .rpc_resp = &res,
3842         };
3843         int status;
3844         int i;
3845
3846         bitmask[0] = FATTR4_WORD0_SUPPORTED_ATTRS |
3847                      FATTR4_WORD0_FH_EXPIRE_TYPE |
3848                      FATTR4_WORD0_LINK_SUPPORT |
3849                      FATTR4_WORD0_SYMLINK_SUPPORT |
3850                      FATTR4_WORD0_ACLSUPPORT |
3851                      FATTR4_WORD0_CASE_INSENSITIVE |
3852                      FATTR4_WORD0_CASE_PRESERVING;
3853         if (minorversion)
3854                 bitmask[2] = FATTR4_WORD2_SUPPATTR_EXCLCREAT;
3855
3856         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
3857         if (status == 0) {
3858                 /* Sanity check the server answers */
3859                 switch (minorversion) {
3860                 case 0:
3861                         res.attr_bitmask[1] &= FATTR4_WORD1_NFS40_MASK;
3862                         res.attr_bitmask[2] = 0;
3863                         break;
3864                 case 1:
3865                         res.attr_bitmask[2] &= FATTR4_WORD2_NFS41_MASK;
3866                         break;
3867                 case 2:
3868                         res.attr_bitmask[2] &= FATTR4_WORD2_NFS42_MASK;
3869                 }
3870                 memcpy(server->attr_bitmask, res.attr_bitmask, sizeof(server->attr_bitmask));
3871                 server->caps &= ~(NFS_CAP_ACLS | NFS_CAP_HARDLINKS |
3872                                   NFS_CAP_SYMLINKS| NFS_CAP_SECURITY_LABEL);
3873                 server->fattr_valid = NFS_ATTR_FATTR_V4;
3874                 if (res.attr_bitmask[0] & FATTR4_WORD0_ACL &&
3875                                 res.acl_bitmask & ACL4_SUPPORT_ALLOW_ACL)
3876                         server->caps |= NFS_CAP_ACLS;
3877                 if (res.has_links != 0)
3878                         server->caps |= NFS_CAP_HARDLINKS;
3879                 if (res.has_symlinks != 0)
3880                         server->caps |= NFS_CAP_SYMLINKS;
3881                 if (res.case_insensitive)
3882                         server->caps |= NFS_CAP_CASE_INSENSITIVE;
3883                 if (res.case_preserving)
3884                         server->caps |= NFS_CAP_CASE_PRESERVING;
3885 #ifdef CONFIG_NFS_V4_SECURITY_LABEL
3886                 if (res.attr_bitmask[2] & FATTR4_WORD2_SECURITY_LABEL)
3887                         server->caps |= NFS_CAP_SECURITY_LABEL;
3888 #endif
3889                 if (res.attr_bitmask[0] & FATTR4_WORD0_FS_LOCATIONS)
3890                         server->caps |= NFS_CAP_FS_LOCATIONS;
3891                 if (!(res.attr_bitmask[0] & FATTR4_WORD0_FILEID))
3892                         server->fattr_valid &= ~NFS_ATTR_FATTR_FILEID;
3893                 if (!(res.attr_bitmask[1] & FATTR4_WORD1_MODE))
3894                         server->fattr_valid &= ~NFS_ATTR_FATTR_MODE;
3895                 if (!(res.attr_bitmask[1] & FATTR4_WORD1_NUMLINKS))
3896                         server->fattr_valid &= ~NFS_ATTR_FATTR_NLINK;
3897                 if (!(res.attr_bitmask[1] & FATTR4_WORD1_OWNER))
3898                         server->fattr_valid &= ~(NFS_ATTR_FATTR_OWNER |
3899                                 NFS_ATTR_FATTR_OWNER_NAME);
3900                 if (!(res.attr_bitmask[1] & FATTR4_WORD1_OWNER_GROUP))
3901                         server->fattr_valid &= ~(NFS_ATTR_FATTR_GROUP |
3902                                 NFS_ATTR_FATTR_GROUP_NAME);
3903                 if (!(res.attr_bitmask[1] & FATTR4_WORD1_SPACE_USED))
3904                         server->fattr_valid &= ~NFS_ATTR_FATTR_SPACE_USED;
3905                 if (!(res.attr_bitmask[1] & FATTR4_WORD1_TIME_ACCESS))
3906                         server->fattr_valid &= ~NFS_ATTR_FATTR_ATIME;
3907                 if (!(res.attr_bitmask[1] & FATTR4_WORD1_TIME_METADATA))
3908                         server->fattr_valid &= ~NFS_ATTR_FATTR_CTIME;
3909                 if (!(res.attr_bitmask[1] & FATTR4_WORD1_TIME_MODIFY))
3910                         server->fattr_valid &= ~NFS_ATTR_FATTR_MTIME;
3911                 memcpy(server->attr_bitmask_nl, res.attr_bitmask,
3912                                 sizeof(server->attr_bitmask));
3913                 server->attr_bitmask_nl[2] &= ~FATTR4_WORD2_SECURITY_LABEL;
3914
3915                 memcpy(server->cache_consistency_bitmask, res.attr_bitmask, sizeof(server->cache_consistency_bitmask));
3916                 server->cache_consistency_bitmask[0] &= FATTR4_WORD0_CHANGE|FATTR4_WORD0_SIZE;
3917                 server->cache_consistency_bitmask[1] &= FATTR4_WORD1_TIME_METADATA|FATTR4_WORD1_TIME_MODIFY;
3918                 server->cache_consistency_bitmask[2] = 0;
3919
3920                 /* Avoid a regression due to buggy server */
3921                 for (i = 0; i < ARRAY_SIZE(res.exclcreat_bitmask); i++)
3922                         res.exclcreat_bitmask[i] &= res.attr_bitmask[i];
3923                 memcpy(server->exclcreat_bitmask, res.exclcreat_bitmask,
3924                         sizeof(server->exclcreat_bitmask));
3925
3926                 server->acl_bitmask = res.acl_bitmask;
3927                 server->fh_expire_type = res.fh_expire_type;
3928         }
3929
3930         return status;
3931 }
3932
3933 int nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle)
3934 {
3935         struct nfs4_exception exception = {
3936                 .interruptible = true,
3937         };
3938         int err;
3939
3940         nfs4_server_set_init_caps(server);
3941         do {
3942                 err = nfs4_handle_exception(server,
3943                                 _nfs4_server_capabilities(server, fhandle),
3944                                 &exception);
3945         } while (exception.retry);
3946         return err;
3947 }
3948
3949 static void test_fs_location_for_trunking(struct nfs4_fs_location *location,
3950                                           struct nfs_client *clp,
3951                                           struct nfs_server *server)
3952 {
3953         int i;
3954
3955         for (i = 0; i < location->nservers; i++) {
3956                 struct nfs4_string *srv_loc = &location->servers[i];
3957                 struct sockaddr_storage addr;
3958                 size_t addrlen;
3959                 struct xprt_create xprt_args = {
3960                         .ident = 0,
3961                         .net = clp->cl_net,
3962                 };
3963                 struct nfs4_add_xprt_data xprtdata = {
3964                         .clp = clp,
3965                 };
3966                 struct rpc_add_xprt_test rpcdata = {
3967                         .add_xprt_test = clp->cl_mvops->session_trunk,
3968                         .data = &xprtdata,
3969                 };
3970                 char *servername = NULL;
3971
3972                 if (!srv_loc->len)
3973                         continue;
3974
3975                 addrlen = nfs_parse_server_name(srv_loc->data, srv_loc->len,
3976                                                 &addr, sizeof(addr),
3977                                                 clp->cl_net, server->port);
3978                 if (!addrlen)
3979                         return;
3980                 xprt_args.dstaddr = (struct sockaddr *)&addr;
3981                 xprt_args.addrlen = addrlen;
3982                 servername = kmalloc(srv_loc->len + 1, GFP_KERNEL);
3983                 if (!servername)
3984                         return;
3985                 memcpy(servername, srv_loc->data, srv_loc->len);
3986                 servername[srv_loc->len] = '\0';
3987                 xprt_args.servername = servername;
3988
3989                 xprtdata.cred = nfs4_get_clid_cred(clp);
3990                 rpc_clnt_add_xprt(clp->cl_rpcclient, &xprt_args,
3991                                   rpc_clnt_setup_test_and_add_xprt,
3992                                   &rpcdata);
3993                 if (xprtdata.cred)
3994                         put_cred(xprtdata.cred);
3995                 kfree(servername);
3996         }
3997 }
3998
3999 static int _nfs4_discover_trunking(struct nfs_server *server,
4000                                    struct nfs_fh *fhandle)
4001 {
4002         struct nfs4_fs_locations *locations = NULL;
4003         struct page *page;
4004         const struct cred *cred;
4005         struct nfs_client *clp = server->nfs_client;
4006         const struct nfs4_state_maintenance_ops *ops =
4007                 clp->cl_mvops->state_renewal_ops;
4008         int status = -ENOMEM, i;
4009
4010         cred = ops->get_state_renewal_cred(clp);
4011         if (cred == NULL) {
4012                 cred = nfs4_get_clid_cred(clp);
4013                 if (cred == NULL)
4014                         return -ENOKEY;
4015         }
4016
4017         page = alloc_page(GFP_KERNEL);
4018         if (!page)
4019                 goto out_put_cred;
4020         locations = kmalloc(sizeof(struct nfs4_fs_locations), GFP_KERNEL);
4021         if (!locations)
4022                 goto out_free;
4023         locations->fattr = nfs_alloc_fattr();
4024         if (!locations->fattr)
4025                 goto out_free_2;
4026
4027         status = nfs4_proc_get_locations(server, fhandle, locations, page,
4028                                          cred);
4029         if (status)
4030                 goto out_free_3;
4031
4032         for (i = 0; i < locations->nlocations; i++)
4033                 test_fs_location_for_trunking(&locations->locations[i], clp,
4034                                               server);
4035 out_free_3:
4036         kfree(locations->fattr);
4037 out_free_2:
4038         kfree(locations);
4039 out_free:
4040         __free_page(page);
4041 out_put_cred:
4042         put_cred(cred);
4043         return status;
4044 }
4045
4046 static int nfs4_discover_trunking(struct nfs_server *server,
4047                                   struct nfs_fh *fhandle)
4048 {
4049         struct nfs4_exception exception = {
4050                 .interruptible = true,
4051         };
4052         struct nfs_client *clp = server->nfs_client;
4053         int err = 0;
4054
4055         if (!nfs4_has_session(clp))
4056                 goto out;
4057         do {
4058                 err = nfs4_handle_exception(server,
4059                                 _nfs4_discover_trunking(server, fhandle),
4060                                 &exception);
4061         } while (exception.retry);
4062 out:
4063         return err;
4064 }
4065
4066 static int _nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle,
4067                 struct nfs_fsinfo *info)
4068 {
4069         u32 bitmask[3];
4070         struct nfs4_lookup_root_arg args = {
4071                 .bitmask = bitmask,
4072         };
4073         struct nfs4_lookup_res res = {
4074                 .server = server,
4075                 .fattr = info->fattr,
4076                 .fh = fhandle,
4077         };
4078         struct rpc_message msg = {
4079                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP_ROOT],
4080                 .rpc_argp = &args,
4081                 .rpc_resp = &res,
4082         };
4083
4084         bitmask[0] = nfs4_fattr_bitmap[0];
4085         bitmask[1] = nfs4_fattr_bitmap[1];
4086         /*
4087          * Process the label in the upcoming getfattr
4088          */
4089         bitmask[2] = nfs4_fattr_bitmap[2] & ~FATTR4_WORD2_SECURITY_LABEL;
4090
4091         nfs_fattr_init(info->fattr);
4092         return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
4093 }
4094
4095 static int nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle,
4096                 struct nfs_fsinfo *info)
4097 {
4098         struct nfs4_exception exception = {
4099                 .interruptible = true,
4100         };
4101         int err;
4102         do {
4103                 err = _nfs4_lookup_root(server, fhandle, info);
4104                 trace_nfs4_lookup_root(server, fhandle, info->fattr, err);
4105                 switch (err) {
4106                 case 0:
4107                 case -NFS4ERR_WRONGSEC:
4108                         goto out;
4109                 default:
4110                         err = nfs4_handle_exception(server, err, &exception);
4111                 }
4112         } while (exception.retry);
4113 out:
4114         return err;
4115 }
4116
4117 static int nfs4_lookup_root_sec(struct nfs_server *server, struct nfs_fh *fhandle,
4118                                 struct nfs_fsinfo *info, rpc_authflavor_t flavor)
4119 {
4120         struct rpc_auth_create_args auth_args = {
4121                 .pseudoflavor = flavor,
4122         };
4123         struct rpc_auth *auth;
4124
4125         auth = rpcauth_create(&auth_args, server->client);
4126         if (IS_ERR(auth))
4127                 return -EACCES;
4128         return nfs4_lookup_root(server, fhandle, info);
4129 }
4130
4131 /*
4132  * Retry pseudoroot lookup with various security flavors.  We do this when:
4133  *
4134  *   NFSv4.0: the PUTROOTFH operation returns NFS4ERR_WRONGSEC
4135  *   NFSv4.1: the server does not support the SECINFO_NO_NAME operation
4136  *
4137  * Returns zero on success, or a negative NFS4ERR value, or a
4138  * negative errno value.
4139  */
4140 static int nfs4_find_root_sec(struct nfs_server *server, struct nfs_fh *fhandle,
4141                               struct nfs_fsinfo *info)
4142 {
4143         /* Per 3530bis 15.33.5 */
4144         static const rpc_authflavor_t flav_array[] = {
4145                 RPC_AUTH_GSS_KRB5P,
4146                 RPC_AUTH_GSS_KRB5I,
4147                 RPC_AUTH_GSS_KRB5,
4148                 RPC_AUTH_UNIX,                  /* courtesy */
4149                 RPC_AUTH_NULL,
4150         };
4151         int status = -EPERM;
4152         size_t i;
4153
4154         if (server->auth_info.flavor_len > 0) {
4155                 /* try each flavor specified by user */
4156                 for (i = 0; i < server->auth_info.flavor_len; i++) {
4157                         status = nfs4_lookup_root_sec(server, fhandle, info,
4158                                                 server->auth_info.flavors[i]);
4159                         if (status == -NFS4ERR_WRONGSEC || status == -EACCES)
4160                                 continue;
4161                         break;
4162                 }
4163         } else {
4164                 /* no flavors specified by user, try default list */
4165                 for (i = 0; i < ARRAY_SIZE(flav_array); i++) {
4166                         status = nfs4_lookup_root_sec(server, fhandle, info,
4167                                                       flav_array[i]);
4168                         if (status == -NFS4ERR_WRONGSEC || status == -EACCES)
4169                                 continue;
4170                         break;
4171                 }
4172         }
4173
4174         /*
4175          * -EACCES could mean that the user doesn't have correct permissions
4176          * to access the mount.  It could also mean that we tried to mount
4177          * with a gss auth flavor, but rpc.gssd isn't running.  Either way,
4178          * existing mount programs don't handle -EACCES very well so it should
4179          * be mapped to -EPERM instead.
4180          */
4181         if (status == -EACCES)
4182                 status = -EPERM;
4183         return status;
4184 }
4185
4186 /**
4187  * nfs4_proc_get_rootfh - get file handle for server's pseudoroot
4188  * @server: initialized nfs_server handle
4189  * @fhandle: we fill in the pseudo-fs root file handle
4190  * @info: we fill in an FSINFO struct
4191  * @auth_probe: probe the auth flavours
4192  *
4193  * Returns zero on success, or a negative errno.
4194  */
4195 int nfs4_proc_get_rootfh(struct nfs_server *server, struct nfs_fh *fhandle,
4196                          struct nfs_fsinfo *info,
4197                          bool auth_probe)
4198 {
4199         int status = 0;
4200
4201         if (!auth_probe)
4202                 status = nfs4_lookup_root(server, fhandle, info);
4203
4204         if (auth_probe || status == NFS4ERR_WRONGSEC)
4205                 status = server->nfs_client->cl_mvops->find_root_sec(server,
4206                                 fhandle, info);
4207
4208         if (status == 0)
4209                 status = nfs4_server_capabilities(server, fhandle);
4210         if (status == 0)
4211                 status = nfs4_do_fsinfo(server, fhandle, info);
4212
4213         return nfs4_map_errors(status);
4214 }
4215
4216 static int nfs4_proc_get_root(struct nfs_server *server, struct nfs_fh *mntfh,
4217                               struct nfs_fsinfo *info)
4218 {
4219         int error;
4220         struct nfs_fattr *fattr = info->fattr;
4221
4222         error = nfs4_server_capabilities(server, mntfh);
4223         if (error < 0) {
4224                 dprintk("nfs4_get_root: getcaps error = %d\n", -error);
4225                 return error;
4226         }
4227
4228         error = nfs4_proc_getattr(server, mntfh, fattr, NULL);
4229         if (error < 0) {
4230                 dprintk("nfs4_get_root: getattr error = %d\n", -error);
4231                 goto out;
4232         }
4233
4234         if (fattr->valid & NFS_ATTR_FATTR_FSID &&
4235             !nfs_fsid_equal(&server->fsid, &fattr->fsid))
4236                 memcpy(&server->fsid, &fattr->fsid, sizeof(server->fsid));
4237
4238 out:
4239         return error;
4240 }
4241
4242 /*
4243  * Get locations and (maybe) other attributes of a referral.
4244  * Note that we'll actually follow the referral later when
4245  * we detect fsid mismatch in inode revalidation
4246  */
4247 static int nfs4_get_referral(struct rpc_clnt *client, struct inode *dir,
4248                              const struct qstr *name, struct nfs_fattr *fattr,
4249                              struct nfs_fh *fhandle)
4250 {
4251         int status = -ENOMEM;
4252         struct page *page = NULL;
4253         struct nfs4_fs_locations *locations = NULL;
4254
4255         page = alloc_page(GFP_KERNEL);
4256         if (page == NULL)
4257                 goto out;
4258         locations = kmalloc(sizeof(struct nfs4_fs_locations), GFP_KERNEL);
4259         if (locations == NULL)
4260                 goto out;
4261
4262         locations->fattr = fattr;
4263
4264         status = nfs4_proc_fs_locations(client, dir, name, locations, page);
4265         if (status != 0)
4266                 goto out;
4267
4268         /*
4269          * If the fsid didn't change, this is a migration event, not a
4270          * referral.  Cause us to drop into the exception handler, which
4271          * will kick off migration recovery.
4272          */
4273         if (nfs_fsid_equal(&NFS_SERVER(dir)->fsid, &fattr->fsid)) {
4274                 dprintk("%s: server did not return a different fsid for"
4275                         " a referral at %s\n", __func__, name->name);
4276                 status = -NFS4ERR_MOVED;
4277                 goto out;
4278         }
4279         /* Fixup attributes for the nfs_lookup() call to nfs_fhget() */
4280         nfs_fixup_referral_attributes(fattr);
4281         memset(fhandle, 0, sizeof(struct nfs_fh));
4282 out:
4283         if (page)
4284                 __free_page(page);
4285         kfree(locations);
4286         return status;
4287 }
4288
4289 static int _nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle,
4290                                 struct nfs_fattr *fattr, struct inode *inode)
4291 {
4292         __u32 bitmask[NFS4_BITMASK_SZ];
4293         struct nfs4_getattr_arg args = {
4294                 .fh = fhandle,
4295                 .bitmask = bitmask,
4296         };
4297         struct nfs4_getattr_res res = {
4298                 .fattr = fattr,
4299                 .server = server,
4300         };
4301         struct rpc_message msg = {
4302                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETATTR],
4303                 .rpc_argp = &args,
4304                 .rpc_resp = &res,
4305         };
4306         unsigned short task_flags = 0;
4307
4308         if (nfs4_has_session(server->nfs_client))
4309                 task_flags = RPC_TASK_MOVEABLE;
4310
4311         /* Is this is an attribute revalidation, subject to softreval? */
4312         if (inode && (server->flags & NFS_MOUNT_SOFTREVAL))
4313                 task_flags |= RPC_TASK_TIMEOUT;
4314
4315         nfs4_bitmap_copy_adjust(bitmask, nfs4_bitmask(server, fattr->label), inode, 0);
4316         nfs_fattr_init(fattr);
4317         nfs4_init_sequence(&args.seq_args, &res.seq_res, 0, 0);
4318         return nfs4_do_call_sync(server->client, server, &msg,
4319                         &args.seq_args, &res.seq_res, task_flags);
4320 }
4321
4322 int nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle,
4323                                 struct nfs_fattr *fattr, struct inode *inode)
4324 {
4325         struct nfs4_exception exception = {
4326                 .interruptible = true,
4327         };
4328         int err;
4329         do {
4330                 err = _nfs4_proc_getattr(server, fhandle, fattr, inode);
4331                 trace_nfs4_getattr(server, fhandle, fattr, err);
4332                 err = nfs4_handle_exception(server, err,
4333                                 &exception);
4334         } while (exception.retry);
4335         return err;
4336 }
4337
4338 /*
4339  * The file is not closed if it is opened due to the a request to change
4340  * the size of the file. The open call will not be needed once the
4341  * VFS layer lookup-intents are implemented.
4342  *
4343  * Close is called when the inode is destroyed.
4344  * If we haven't opened the file for O_WRONLY, we
4345  * need to in the size_change case to obtain a stateid.
4346  *
4347  * Got race?
4348  * Because OPEN is always done by name in nfsv4, it is
4349  * possible that we opened a different file by the same
4350  * name.  We can recognize this race condition, but we
4351  * can't do anything about it besides returning an error.
4352  *
4353  * This will be fixed with VFS changes (lookup-intent).
4354  */
4355 static int
4356 nfs4_proc_setattr(struct dentry *dentry, struct nfs_fattr *fattr,
4357                   struct iattr *sattr)
4358 {
4359         struct inode *inode = d_inode(dentry);
4360         const struct cred *cred = NULL;
4361         struct nfs_open_context *ctx = NULL;
4362         int status;
4363
4364         if (pnfs_ld_layoutret_on_setattr(inode) &&
4365             sattr->ia_valid & ATTR_SIZE &&
4366             sattr->ia_size < i_size_read(inode))
4367                 pnfs_commit_and_return_layout(inode);
4368
4369         nfs_fattr_init(fattr);
4370
4371         /* Deal with open(O_TRUNC) */
4372         if (sattr->ia_valid & ATTR_OPEN)
4373                 sattr->ia_valid &= ~(ATTR_MTIME|ATTR_CTIME);
4374
4375         /* Optimization: if the end result is no change, don't RPC */
4376         if ((sattr->ia_valid & ~(ATTR_FILE|ATTR_OPEN)) == 0)
4377                 return 0;
4378
4379         /* Search for an existing open(O_WRITE) file */
4380         if (sattr->ia_valid & ATTR_FILE) {
4381
4382                 ctx = nfs_file_open_context(sattr->ia_file);
4383                 if (ctx)
4384                         cred = ctx->cred;
4385         }
4386
4387         /* Return any delegations if we're going to change ACLs */
4388         if ((sattr->ia_valid & (ATTR_MODE|ATTR_UID|ATTR_GID)) != 0)
4389                 nfs4_inode_make_writeable(inode);
4390
4391         status = nfs4_do_setattr(inode, cred, fattr, sattr, ctx, NULL);
4392         if (status == 0) {
4393                 nfs_setattr_update_inode(inode, sattr, fattr);
4394                 nfs_setsecurity(inode, fattr);
4395         }
4396         return status;
4397 }
4398
4399 static int _nfs4_proc_lookup(struct rpc_clnt *clnt, struct inode *dir,
4400                 struct dentry *dentry, struct nfs_fh *fhandle,
4401                 struct nfs_fattr *fattr)
4402 {
4403         struct nfs_server *server = NFS_SERVER(dir);
4404         int                    status;
4405         struct nfs4_lookup_arg args = {
4406                 .bitmask = server->attr_bitmask,
4407                 .dir_fh = NFS_FH(dir),
4408                 .name = &dentry->d_name,
4409         };
4410         struct nfs4_lookup_res res = {
4411                 .server = server,
4412                 .fattr = fattr,
4413                 .fh = fhandle,
4414         };
4415         struct rpc_message msg = {
4416                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP],
4417                 .rpc_argp = &args,
4418                 .rpc_resp = &res,
4419         };
4420         unsigned short task_flags = 0;
4421
4422         if (nfs_server_capable(dir, NFS_CAP_MOVEABLE))
4423                 task_flags = RPC_TASK_MOVEABLE;
4424
4425         /* Is this is an attribute revalidation, subject to softreval? */
4426         if (nfs_lookup_is_soft_revalidate(dentry))
4427                 task_flags |= RPC_TASK_TIMEOUT;
4428
4429         args.bitmask = nfs4_bitmask(server, fattr->label);
4430
4431         nfs_fattr_init(fattr);
4432
4433         dprintk("NFS call  lookup %pd2\n", dentry);
4434         nfs4_init_sequence(&args.seq_args, &res.seq_res, 0, 0);
4435         status = nfs4_do_call_sync(clnt, server, &msg,
4436                         &args.seq_args, &res.seq_res, task_flags);
4437         dprintk("NFS reply lookup: %d\n", status);
4438         return status;
4439 }
4440
4441 static void nfs_fixup_secinfo_attributes(struct nfs_fattr *fattr)
4442 {
4443         fattr->valid |= NFS_ATTR_FATTR_TYPE | NFS_ATTR_FATTR_MODE |
4444                 NFS_ATTR_FATTR_NLINK | NFS_ATTR_FATTR_MOUNTPOINT;
4445         fattr->mode = S_IFDIR | S_IRUGO | S_IXUGO;
4446         fattr->nlink = 2;
4447 }
4448
4449 static int nfs4_proc_lookup_common(struct rpc_clnt **clnt, struct inode *dir,
4450                                    struct dentry *dentry, struct nfs_fh *fhandle,
4451                                    struct nfs_fattr *fattr)
4452 {
4453         struct nfs4_exception exception = {
4454                 .interruptible = true,
4455         };
4456         struct rpc_clnt *client = *clnt;
4457         const struct qstr *name = &dentry->d_name;
4458         int err;
4459         do {
4460                 err = _nfs4_proc_lookup(client, dir, dentry, fhandle, fattr);
4461                 trace_nfs4_lookup(dir, name, err);
4462                 switch (err) {
4463                 case -NFS4ERR_BADNAME:
4464                         err = -ENOENT;
4465                         goto out;
4466                 case -NFS4ERR_MOVED:
4467                         err = nfs4_get_referral(client, dir, name, fattr, fhandle);
4468                         if (err == -NFS4ERR_MOVED)
4469                                 err = nfs4_handle_exception(NFS_SERVER(dir), err, &exception);
4470                         goto out;
4471                 case -NFS4ERR_WRONGSEC:
4472                         err = -EPERM;
4473                         if (client != *clnt)
4474                                 goto out;
4475                         client = nfs4_negotiate_security(client, dir, name);
4476                         if (IS_ERR(client))
4477                                 return PTR_ERR(client);
4478
4479                         exception.retry = 1;
4480                         break;
4481                 default:
4482                         err = nfs4_handle_exception(NFS_SERVER(dir), err, &exception);
4483                 }
4484         } while (exception.retry);
4485
4486 out:
4487         if (err == 0)
4488                 *clnt = client;
4489         else if (client != *clnt)
4490                 rpc_shutdown_client(client);
4491
4492         return err;
4493 }
4494
4495 static int nfs4_proc_lookup(struct inode *dir, struct dentry *dentry,
4496                             struct nfs_fh *fhandle, struct nfs_fattr *fattr)
4497 {
4498         int status;
4499         struct rpc_clnt *client = NFS_CLIENT(dir);
4500
4501         status = nfs4_proc_lookup_common(&client, dir, dentry, fhandle, fattr);
4502         if (client != NFS_CLIENT(dir)) {
4503                 rpc_shutdown_client(client);
4504                 nfs_fixup_secinfo_attributes(fattr);
4505         }
4506         return status;
4507 }
4508
4509 struct rpc_clnt *
4510 nfs4_proc_lookup_mountpoint(struct inode *dir, struct dentry *dentry,
4511                             struct nfs_fh *fhandle, struct nfs_fattr *fattr)
4512 {
4513         struct rpc_clnt *client = NFS_CLIENT(dir);
4514         int status;
4515
4516         status = nfs4_proc_lookup_common(&client, dir, dentry, fhandle, fattr);
4517         if (status < 0)
4518                 return ERR_PTR(status);
4519         return (client == NFS_CLIENT(dir)) ? rpc_clone_client(client) : client;
4520 }
4521
4522 static int _nfs4_proc_lookupp(struct inode *inode,
4523                 struct nfs_fh *fhandle, struct nfs_fattr *fattr)
4524 {
4525         struct rpc_clnt *clnt = NFS_CLIENT(inode);
4526         struct nfs_server *server = NFS_SERVER(inode);
4527         int                    status;
4528         struct nfs4_lookupp_arg args = {
4529                 .bitmask = server->attr_bitmask,
4530                 .fh = NFS_FH(inode),
4531         };
4532         struct nfs4_lookupp_res res = {
4533                 .server = server,
4534                 .fattr = fattr,
4535                 .fh = fhandle,
4536         };
4537         struct rpc_message msg = {
4538                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUPP],
4539                 .rpc_argp = &args,
4540                 .rpc_resp = &res,
4541         };
4542         unsigned short task_flags = 0;
4543
4544         if (NFS_SERVER(inode)->flags & NFS_MOUNT_SOFTREVAL)
4545                 task_flags |= RPC_TASK_TIMEOUT;
4546
4547         args.bitmask = nfs4_bitmask(server, fattr->label);
4548
4549         nfs_fattr_init(fattr);
4550
4551         dprintk("NFS call  lookupp ino=0x%lx\n", inode->i_ino);
4552         status = nfs4_call_sync(clnt, server, &msg, &args.seq_args,
4553                                 &res.seq_res, task_flags);
4554         dprintk("NFS reply lookupp: %d\n", status);
4555         return status;
4556 }
4557
4558 static int nfs4_proc_lookupp(struct inode *inode, struct nfs_fh *fhandle,
4559                              struct nfs_fattr *fattr)
4560 {
4561         struct nfs4_exception exception = {
4562                 .interruptible = true,
4563         };
4564         int err;
4565         do {
4566                 err = _nfs4_proc_lookupp(inode, fhandle, fattr);
4567                 trace_nfs4_lookupp(inode, err);
4568                 err = nfs4_handle_exception(NFS_SERVER(inode), err,
4569                                 &exception);
4570         } while (exception.retry);
4571         return err;
4572 }
4573
4574 static int _nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry,
4575                              const struct cred *cred)
4576 {
4577         struct nfs_server *server = NFS_SERVER(inode);
4578         struct nfs4_accessargs args = {
4579                 .fh = NFS_FH(inode),
4580                 .access = entry->mask,
4581         };
4582         struct nfs4_accessres res = {
4583                 .server = server,
4584         };
4585         struct rpc_message msg = {
4586                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_ACCESS],
4587                 .rpc_argp = &args,
4588                 .rpc_resp = &res,
4589                 .rpc_cred = cred,
4590         };
4591         int status = 0;
4592
4593         if (!nfs4_have_delegation(inode, FMODE_READ)) {
4594                 res.fattr = nfs_alloc_fattr();
4595                 if (res.fattr == NULL)
4596                         return -ENOMEM;
4597                 args.bitmask = server->cache_consistency_bitmask;
4598         }
4599         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
4600         if (!status) {
4601                 nfs_access_set_mask(entry, res.access);
4602                 if (res.fattr)
4603                         nfs_refresh_inode(inode, res.fattr);
4604         }
4605         nfs_free_fattr(res.fattr);
4606         return status;
4607 }
4608
4609 static int nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry,
4610                             const struct cred *cred)
4611 {
4612         struct nfs4_exception exception = {
4613                 .interruptible = true,
4614         };
4615         int err;
4616         do {
4617                 err = _nfs4_proc_access(inode, entry, cred);
4618                 trace_nfs4_access(inode, err);
4619                 err = nfs4_handle_exception(NFS_SERVER(inode), err,
4620                                 &exception);
4621         } while (exception.retry);
4622         return err;
4623 }
4624
4625 /*
4626  * TODO: For the time being, we don't try to get any attributes
4627  * along with any of the zero-copy operations READ, READDIR,
4628  * READLINK, WRITE.
4629  *
4630  * In the case of the first three, we want to put the GETATTR
4631  * after the read-type operation -- this is because it is hard
4632  * to predict the length of a GETATTR response in v4, and thus
4633  * align the READ data correctly.  This means that the GETATTR
4634  * may end up partially falling into the page cache, and we should
4635  * shift it into the 'tail' of the xdr_buf before processing.
4636  * To do this efficiently, we need to know the total length
4637  * of data received, which doesn't seem to be available outside
4638  * of the RPC layer.
4639  *
4640  * In the case of WRITE, we also want to put the GETATTR after
4641  * the operation -- in this case because we want to make sure
4642  * we get the post-operation mtime and size.
4643  *
4644  * Both of these changes to the XDR layer would in fact be quite
4645  * minor, but I decided to leave them for a subsequent patch.
4646  */
4647 static int _nfs4_proc_readlink(struct inode *inode, struct page *page,
4648                 unsigned int pgbase, unsigned int pglen)
4649 {
4650         struct nfs4_readlink args = {
4651                 .fh       = NFS_FH(inode),
4652                 .pgbase   = pgbase,
4653                 .pglen    = pglen,
4654                 .pages    = &page,
4655         };
4656         struct nfs4_readlink_res res;
4657         struct rpc_message msg = {
4658                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READLINK],
4659                 .rpc_argp = &args,
4660                 .rpc_resp = &res,
4661         };
4662
4663         return nfs4_call_sync(NFS_SERVER(inode)->client, NFS_SERVER(inode), &msg, &args.seq_args, &res.seq_res, 0);
4664 }
4665
4666 static int nfs4_proc_readlink(struct inode *inode, struct page *page,
4667                 unsigned int pgbase, unsigned int pglen)
4668 {
4669         struct nfs4_exception exception = {
4670                 .interruptible = true,
4671         };
4672         int err;
4673         do {
4674                 err = _nfs4_proc_readlink(inode, page, pgbase, pglen);
4675                 trace_nfs4_readlink(inode, err);
4676                 err = nfs4_handle_exception(NFS_SERVER(inode), err,
4677                                 &exception);
4678         } while (exception.retry);
4679         return err;
4680 }
4681
4682 /*
4683  * This is just for mknod.  open(O_CREAT) will always do ->open_context().
4684  */
4685 static int
4686 nfs4_proc_create(struct inode *dir, struct dentry *dentry, struct iattr *sattr,
4687                  int flags)
4688 {
4689         struct nfs_server *server = NFS_SERVER(dir);
4690         struct nfs4_label l, *ilabel;
4691         struct nfs_open_context *ctx;
4692         struct nfs4_state *state;
4693         int status = 0;
4694
4695         ctx = alloc_nfs_open_context(dentry, FMODE_READ, NULL);
4696         if (IS_ERR(ctx))
4697                 return PTR_ERR(ctx);
4698
4699         ilabel = nfs4_label_init_security(dir, dentry, sattr, &l);
4700
4701         if (!(server->attr_bitmask[2] & FATTR4_WORD2_MODE_UMASK))
4702                 sattr->ia_mode &= ~current_umask();
4703         state = nfs4_do_open(dir, ctx, flags, sattr, ilabel, NULL);
4704         if (IS_ERR(state)) {
4705                 status = PTR_ERR(state);
4706                 goto out;
4707         }
4708 out:
4709         nfs4_label_release_security(ilabel);
4710         put_nfs_open_context(ctx);
4711         return status;
4712 }
4713
4714 static int
4715 _nfs4_proc_remove(struct inode *dir, const struct qstr *name, u32 ftype)
4716 {
4717         struct nfs_server *server = NFS_SERVER(dir);
4718         struct nfs_removeargs args = {
4719                 .fh = NFS_FH(dir),
4720                 .name = *name,
4721         };
4722         struct nfs_removeres res = {
4723                 .server = server,
4724         };
4725         struct rpc_message msg = {
4726                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE],
4727                 .rpc_argp = &args,
4728                 .rpc_resp = &res,
4729         };
4730         unsigned long timestamp = jiffies;
4731         int status;
4732
4733         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 1);
4734         if (status == 0) {
4735                 spin_lock(&dir->i_lock);
4736                 /* Removing a directory decrements nlink in the parent */
4737                 if (ftype == NF4DIR && dir->i_nlink > 2)
4738                         nfs4_dec_nlink_locked(dir);
4739                 nfs4_update_changeattr_locked(dir, &res.cinfo, timestamp,
4740                                               NFS_INO_INVALID_DATA);
4741                 spin_unlock(&dir->i_lock);
4742         }
4743         return status;
4744 }
4745
4746 static int nfs4_proc_remove(struct inode *dir, struct dentry *dentry)
4747 {
4748         struct nfs4_exception exception = {
4749                 .interruptible = true,
4750         };
4751         struct inode *inode = d_inode(dentry);
4752         int err;
4753
4754         if (inode) {
4755                 if (inode->i_nlink == 1)
4756                         nfs4_inode_return_delegation(inode);
4757                 else
4758                         nfs4_inode_make_writeable(inode);
4759         }
4760         do {
4761                 err = _nfs4_proc_remove(dir, &dentry->d_name, NF4REG);
4762                 trace_nfs4_remove(dir, &dentry->d_name, err);
4763                 err = nfs4_handle_exception(NFS_SERVER(dir), err,
4764                                 &exception);
4765         } while (exception.retry);
4766         return err;
4767 }
4768
4769 static int nfs4_proc_rmdir(struct inode *dir, const struct qstr *name)
4770 {
4771         struct nfs4_exception exception = {
4772                 .interruptible = true,
4773         };
4774         int err;
4775
4776         do {
4777                 err = _nfs4_proc_remove(dir, name, NF4DIR);
4778                 trace_nfs4_remove(dir, name, err);
4779                 err = nfs4_handle_exception(NFS_SERVER(dir), err,
4780                                 &exception);
4781         } while (exception.retry);
4782         return err;
4783 }
4784
4785 static void nfs4_proc_unlink_setup(struct rpc_message *msg,
4786                 struct dentry *dentry,
4787                 struct inode *inode)
4788 {
4789         struct nfs_removeargs *args = msg->rpc_argp;
4790         struct nfs_removeres *res = msg->rpc_resp;
4791
4792         res->server = NFS_SB(dentry->d_sb);
4793         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE];
4794         nfs4_init_sequence(&args->seq_args, &res->seq_res, 1, 0);
4795
4796         nfs_fattr_init(res->dir_attr);
4797
4798         if (inode) {
4799                 nfs4_inode_return_delegation(inode);
4800                 nfs_d_prune_case_insensitive_aliases(inode);
4801         }
4802 }
4803
4804 static void nfs4_proc_unlink_rpc_prepare(struct rpc_task *task, struct nfs_unlinkdata *data)
4805 {
4806         nfs4_setup_sequence(NFS_SB(data->dentry->d_sb)->nfs_client,
4807                         &data->args.seq_args,
4808                         &data->res.seq_res,
4809                         task);
4810 }
4811
4812 static int nfs4_proc_unlink_done(struct rpc_task *task, struct inode *dir)
4813 {
4814         struct nfs_unlinkdata *data = task->tk_calldata;
4815         struct nfs_removeres *res = &data->res;
4816
4817         if (!nfs4_sequence_done(task, &res->seq_res))
4818                 return 0;
4819         if (nfs4_async_handle_error(task, res->server, NULL,
4820                                     &data->timeout) == -EAGAIN)
4821                 return 0;
4822         if (task->tk_status == 0)
4823                 nfs4_update_changeattr(dir, &res->cinfo,
4824                                 res->dir_attr->time_start,
4825                                 NFS_INO_INVALID_DATA);
4826         return 1;
4827 }
4828
4829 static void nfs4_proc_rename_setup(struct rpc_message *msg,
4830                 struct dentry *old_dentry,
4831                 struct dentry *new_dentry)
4832 {
4833         struct nfs_renameargs *arg = msg->rpc_argp;
4834         struct nfs_renameres *res = msg->rpc_resp;
4835         struct inode *old_inode = d_inode(old_dentry);
4836         struct inode *new_inode = d_inode(new_dentry);
4837
4838         if (old_inode)
4839                 nfs4_inode_make_writeable(old_inode);
4840         if (new_inode)
4841                 nfs4_inode_return_delegation(new_inode);
4842         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENAME];
4843         res->server = NFS_SB(old_dentry->d_sb);
4844         nfs4_init_sequence(&arg->seq_args, &res->seq_res, 1, 0);
4845 }
4846
4847 static void nfs4_proc_rename_rpc_prepare(struct rpc_task *task, struct nfs_renamedata *data)
4848 {
4849         nfs4_setup_sequence(NFS_SERVER(data->old_dir)->nfs_client,
4850                         &data->args.seq_args,
4851                         &data->res.seq_res,
4852                         task);
4853 }
4854
4855 static int nfs4_proc_rename_done(struct rpc_task *task, struct inode *old_dir,
4856                                  struct inode *new_dir)
4857 {
4858         struct nfs_renamedata *data = task->tk_calldata;
4859         struct nfs_renameres *res = &data->res;
4860
4861         if (!nfs4_sequence_done(task, &res->seq_res))
4862                 return 0;
4863         if (nfs4_async_handle_error(task, res->server, NULL, &data->timeout) == -EAGAIN)
4864                 return 0;
4865
4866         if (task->tk_status == 0) {
4867                 nfs_d_prune_case_insensitive_aliases(d_inode(data->old_dentry));
4868                 if (new_dir != old_dir) {
4869                         /* Note: If we moved a directory, nlink will change */
4870                         nfs4_update_changeattr(old_dir, &res->old_cinfo,
4871                                         res->old_fattr->time_start,
4872                                         NFS_INO_INVALID_NLINK |
4873                                             NFS_INO_INVALID_DATA);
4874                         nfs4_update_changeattr(new_dir, &res->new_cinfo,
4875                                         res->new_fattr->time_start,
4876                                         NFS_INO_INVALID_NLINK |
4877                                             NFS_INO_INVALID_DATA);
4878                 } else
4879                         nfs4_update_changeattr(old_dir, &res->old_cinfo,
4880                                         res->old_fattr->time_start,
4881                                         NFS_INO_INVALID_DATA);
4882         }
4883         return 1;
4884 }
4885
4886 static int _nfs4_proc_link(struct inode *inode, struct inode *dir, const struct qstr *name)
4887 {
4888         struct nfs_server *server = NFS_SERVER(inode);
4889         __u32 bitmask[NFS4_BITMASK_SZ];
4890         struct nfs4_link_arg arg = {
4891                 .fh     = NFS_FH(inode),
4892                 .dir_fh = NFS_FH(dir),
4893                 .name   = name,
4894                 .bitmask = bitmask,
4895         };
4896         struct nfs4_link_res res = {
4897                 .server = server,
4898         };
4899         struct rpc_message msg = {
4900                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LINK],
4901                 .rpc_argp = &arg,
4902                 .rpc_resp = &res,
4903         };
4904         int status = -ENOMEM;
4905
4906         res.fattr = nfs_alloc_fattr_with_label(server);
4907         if (res.fattr == NULL)
4908                 goto out;
4909
4910         nfs4_inode_make_writeable(inode);
4911         nfs4_bitmap_copy_adjust(bitmask, nfs4_bitmask(server, res.fattr->label), inode,
4912                                 NFS_INO_INVALID_CHANGE);
4913         status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
4914         if (!status) {
4915                 nfs4_update_changeattr(dir, &res.cinfo, res.fattr->time_start,
4916                                        NFS_INO_INVALID_DATA);
4917                 nfs4_inc_nlink(inode);
4918                 status = nfs_post_op_update_inode(inode, res.fattr);
4919                 if (!status)
4920                         nfs_setsecurity(inode, res.fattr);
4921         }
4922
4923 out:
4924         nfs_free_fattr(res.fattr);
4925         return status;
4926 }
4927
4928 static int nfs4_proc_link(struct inode *inode, struct inode *dir, const struct qstr *name)
4929 {
4930         struct nfs4_exception exception = {
4931                 .interruptible = true,
4932         };
4933         int err;
4934         do {
4935                 err = nfs4_handle_exception(NFS_SERVER(inode),
4936                                 _nfs4_proc_link(inode, dir, name),
4937                                 &exception);
4938         } while (exception.retry);
4939         return err;
4940 }
4941
4942 struct nfs4_createdata {
4943         struct rpc_message msg;
4944         struct nfs4_create_arg arg;
4945         struct nfs4_create_res res;
4946         struct nfs_fh fh;
4947         struct nfs_fattr fattr;
4948 };
4949
4950 static struct nfs4_createdata *nfs4_alloc_createdata(struct inode *dir,
4951                 const struct qstr *name, struct iattr *sattr, u32 ftype)
4952 {
4953         struct nfs4_createdata *data;
4954
4955         data = kzalloc(sizeof(*data), GFP_KERNEL);
4956         if (data != NULL) {
4957                 struct nfs_server *server = NFS_SERVER(dir);
4958
4959                 data->fattr.label = nfs4_label_alloc(server, GFP_KERNEL);
4960                 if (IS_ERR(data->fattr.label))
4961                         goto out_free;
4962
4963                 data->msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE];
4964                 data->msg.rpc_argp = &data->arg;
4965                 data->msg.rpc_resp = &data->res;
4966                 data->arg.dir_fh = NFS_FH(dir);
4967                 data->arg.server = server;
4968                 data->arg.name = name;
4969                 data->arg.attrs = sattr;
4970                 data->arg.ftype = ftype;
4971                 data->arg.bitmask = nfs4_bitmask(server, data->fattr.label);
4972                 data->arg.umask = current_umask();
4973                 data->res.server = server;
4974                 data->res.fh = &data->fh;
4975                 data->res.fattr = &data->fattr;
4976                 nfs_fattr_init(data->res.fattr);
4977         }
4978         return data;
4979 out_free:
4980         kfree(data);
4981         return NULL;
4982 }
4983
4984 static int nfs4_do_create(struct inode *dir, struct dentry *dentry, struct nfs4_createdata *data)
4985 {
4986         int status = nfs4_call_sync(NFS_SERVER(dir)->client, NFS_SERVER(dir), &data->msg,
4987                                     &data->arg.seq_args, &data->res.seq_res, 1);
4988         if (status == 0) {
4989                 spin_lock(&dir->i_lock);
4990                 /* Creating a directory bumps nlink in the parent */
4991                 if (data->arg.ftype == NF4DIR)
4992                         nfs4_inc_nlink_locked(dir);
4993                 nfs4_update_changeattr_locked(dir, &data->res.dir_cinfo,
4994                                               data->res.fattr->time_start,
4995                                               NFS_INO_INVALID_DATA);
4996                 spin_unlock(&dir->i_lock);
4997                 status = nfs_instantiate(dentry, data->res.fh, data->res.fattr);
4998         }
4999         return status;
5000 }
5001
5002 static void nfs4_free_createdata(struct nfs4_createdata *data)
5003 {
5004         nfs4_label_free(data->fattr.label);
5005         kfree(data);
5006 }
5007
5008 static int _nfs4_proc_symlink(struct inode *dir, struct dentry *dentry,
5009                 struct page *page, unsigned int len, struct iattr *sattr,
5010                 struct nfs4_label *label)
5011 {
5012         struct nfs4_createdata *data;
5013         int status = -ENAMETOOLONG;
5014
5015         if (len > NFS4_MAXPATHLEN)
5016                 goto out;
5017
5018         status = -ENOMEM;
5019         data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4LNK);
5020         if (data == NULL)
5021                 goto out;
5022
5023         data->msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SYMLINK];
5024         data->arg.u.symlink.pages = &page;
5025         data->arg.u.symlink.len = len;
5026         data->arg.label = label;
5027
5028         status = nfs4_do_create(dir, dentry, data);
5029
5030         nfs4_free_createdata(data);
5031 out:
5032         return status;
5033 }
5034
5035 static int nfs4_proc_symlink(struct inode *dir, struct dentry *dentry,
5036                 struct page *page, unsigned int len, struct iattr *sattr)
5037 {
5038         struct nfs4_exception exception = {
5039                 .interruptible = true,
5040         };
5041         struct nfs4_label l, *label;
5042         int err;
5043
5044         label = nfs4_label_init_security(dir, dentry, sattr, &l);
5045
5046         do {
5047                 err = _nfs4_proc_symlink(dir, dentry, page, len, sattr, label);
5048                 trace_nfs4_symlink(dir, &dentry->d_name, err);
5049                 err = nfs4_handle_exception(NFS_SERVER(dir), err,
5050                                 &exception);
5051         } while (exception.retry);
5052
5053         nfs4_label_release_security(label);
5054         return err;
5055 }
5056
5057 static int _nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry,
5058                 struct iattr *sattr, struct nfs4_label *label)
5059 {
5060         struct nfs4_createdata *data;
5061         int status = -ENOMEM;
5062
5063         data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4DIR);
5064         if (data == NULL)
5065                 goto out;
5066
5067         data->arg.label = label;
5068         status = nfs4_do_create(dir, dentry, data);
5069
5070         nfs4_free_createdata(data);
5071 out:
5072         return status;
5073 }
5074
5075 static int nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry,
5076                 struct iattr *sattr)
5077 {
5078         struct nfs_server *server = NFS_SERVER(dir);
5079         struct nfs4_exception exception = {
5080                 .interruptible = true,
5081         };
5082         struct nfs4_label l, *label;
5083         int err;
5084
5085         label = nfs4_label_init_security(dir, dentry, sattr, &l);
5086
5087         if (!(server->attr_bitmask[2] & FATTR4_WORD2_MODE_UMASK))
5088                 sattr->ia_mode &= ~current_umask();
5089         do {
5090                 err = _nfs4_proc_mkdir(dir, dentry, sattr, label);
5091                 trace_nfs4_mkdir(dir, &dentry->d_name, err);
5092                 err = nfs4_handle_exception(NFS_SERVER(dir), err,
5093                                 &exception);
5094         } while (exception.retry);
5095         nfs4_label_release_security(label);
5096
5097         return err;
5098 }
5099
5100 static int _nfs4_proc_readdir(struct nfs_readdir_arg *nr_arg,
5101                               struct nfs_readdir_res *nr_res)
5102 {
5103         struct inode            *dir = d_inode(nr_arg->dentry);
5104         struct nfs_server       *server = NFS_SERVER(dir);
5105         struct nfs4_readdir_arg args = {
5106                 .fh = NFS_FH(dir),
5107                 .pages = nr_arg->pages,
5108                 .pgbase = 0,
5109                 .count = nr_arg->page_len,
5110                 .plus = nr_arg->plus,
5111         };
5112         struct nfs4_readdir_res res;
5113         struct rpc_message msg = {
5114                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READDIR],
5115                 .rpc_argp = &args,
5116                 .rpc_resp = &res,
5117                 .rpc_cred = nr_arg->cred,
5118         };
5119         int                     status;
5120
5121         dprintk("%s: dentry = %pd2, cookie = %llu\n", __func__,
5122                 nr_arg->dentry, (unsigned long long)nr_arg->cookie);
5123         if (!(server->caps & NFS_CAP_SECURITY_LABEL))
5124                 args.bitmask = server->attr_bitmask_nl;
5125         else
5126                 args.bitmask = server->attr_bitmask;
5127
5128         nfs4_setup_readdir(nr_arg->cookie, nr_arg->verf, nr_arg->dentry, &args);
5129         res.pgbase = args.pgbase;
5130         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args,
5131                         &res.seq_res, 0);
5132         if (status >= 0) {
5133                 memcpy(nr_res->verf, res.verifier.data, NFS4_VERIFIER_SIZE);
5134                 status += args.pgbase;
5135         }
5136
5137         nfs_invalidate_atime(dir);
5138
5139         dprintk("%s: returns %d\n", __func__, status);
5140         return status;
5141 }
5142
5143 static int nfs4_proc_readdir(struct nfs_readdir_arg *arg,
5144                              struct nfs_readdir_res *res)
5145 {
5146         struct nfs4_exception exception = {
5147                 .interruptible = true,
5148         };
5149         int err;
5150         do {
5151                 err = _nfs4_proc_readdir(arg, res);
5152                 trace_nfs4_readdir(d_inode(arg->dentry), err);
5153                 err = nfs4_handle_exception(NFS_SERVER(d_inode(arg->dentry)),
5154                                             err, &exception);
5155         } while (exception.retry);
5156         return err;
5157 }
5158
5159 static int _nfs4_proc_mknod(struct inode *dir, struct dentry *dentry,
5160                 struct iattr *sattr, struct nfs4_label *label, dev_t rdev)
5161 {
5162         struct nfs4_createdata *data;
5163         int mode = sattr->ia_mode;
5164         int status = -ENOMEM;
5165
5166         data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4SOCK);
5167         if (data == NULL)
5168                 goto out;
5169
5170         if (S_ISFIFO(mode))
5171                 data->arg.ftype = NF4FIFO;
5172         else if (S_ISBLK(mode)) {
5173                 data->arg.ftype = NF4BLK;
5174                 data->arg.u.device.specdata1 = MAJOR(rdev);
5175                 data->arg.u.device.specdata2 = MINOR(rdev);
5176         }
5177         else if (S_ISCHR(mode)) {
5178                 data->arg.ftype = NF4CHR;
5179                 data->arg.u.device.specdata1 = MAJOR(rdev);
5180                 data->arg.u.device.specdata2 = MINOR(rdev);
5181         } else if (!S_ISSOCK(mode)) {
5182                 status = -EINVAL;
5183                 goto out_free;
5184         }
5185
5186         data->arg.label = label;
5187         status = nfs4_do_create(dir, dentry, data);
5188 out_free:
5189         nfs4_free_createdata(data);
5190 out:
5191         return status;
5192 }
5193
5194 static int nfs4_proc_mknod(struct inode *dir, struct dentry *dentry,
5195                 struct iattr *sattr, dev_t rdev)
5196 {
5197         struct nfs_server *server = NFS_SERVER(dir);
5198         struct nfs4_exception exception = {
5199                 .interruptible = true,
5200         };
5201         struct nfs4_label l, *label;
5202         int err;
5203
5204         label = nfs4_label_init_security(dir, dentry, sattr, &l);
5205
5206         if (!(server->attr_bitmask[2] & FATTR4_WORD2_MODE_UMASK))
5207                 sattr->ia_mode &= ~current_umask();
5208         do {
5209                 err = _nfs4_proc_mknod(dir, dentry, sattr, label, rdev);
5210                 trace_nfs4_mknod(dir, &dentry->d_name, err);
5211                 err = nfs4_handle_exception(NFS_SERVER(dir), err,
5212                                 &exception);
5213         } while (exception.retry);
5214
5215         nfs4_label_release_security(label);
5216
5217         return err;
5218 }
5219
5220 static int _nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle,
5221                  struct nfs_fsstat *fsstat)
5222 {
5223         struct nfs4_statfs_arg args = {
5224                 .fh = fhandle,
5225                 .bitmask = server->attr_bitmask,
5226         };
5227         struct nfs4_statfs_res res = {
5228                 .fsstat = fsstat,
5229         };
5230         struct rpc_message msg = {
5231                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_STATFS],
5232                 .rpc_argp = &args,
5233                 .rpc_resp = &res,
5234         };
5235
5236         nfs_fattr_init(fsstat->fattr);
5237         return  nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
5238 }
5239
5240 static int nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsstat *fsstat)
5241 {
5242         struct nfs4_exception exception = {
5243                 .interruptible = true,
5244         };
5245         int err;
5246         do {
5247                 err = nfs4_handle_exception(server,
5248                                 _nfs4_proc_statfs(server, fhandle, fsstat),
5249                                 &exception);
5250         } while (exception.retry);
5251         return err;
5252 }
5253
5254 static int _nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle,
5255                 struct nfs_fsinfo *fsinfo)
5256 {
5257         struct nfs4_fsinfo_arg args = {
5258                 .fh = fhandle,
5259                 .bitmask = server->attr_bitmask,
5260         };
5261         struct nfs4_fsinfo_res res = {
5262                 .fsinfo = fsinfo,
5263         };
5264         struct rpc_message msg = {
5265                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FSINFO],
5266                 .rpc_argp = &args,
5267                 .rpc_resp = &res,
5268         };
5269
5270         return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
5271 }
5272
5273 static int nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo)
5274 {
5275         struct nfs4_exception exception = {
5276                 .interruptible = true,
5277         };
5278         int err;
5279
5280         do {
5281                 err = _nfs4_do_fsinfo(server, fhandle, fsinfo);
5282                 trace_nfs4_fsinfo(server, fhandle, fsinfo->fattr, err);
5283                 if (err == 0) {
5284                         nfs4_set_lease_period(server->nfs_client, fsinfo->lease_time * HZ);
5285                         break;
5286                 }
5287                 err = nfs4_handle_exception(server, err, &exception);
5288         } while (exception.retry);
5289         return err;
5290 }
5291
5292 static int nfs4_proc_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo)
5293 {
5294         int error;
5295
5296         nfs_fattr_init(fsinfo->fattr);
5297         error = nfs4_do_fsinfo(server, fhandle, fsinfo);
5298         if (error == 0) {
5299                 /* block layout checks this! */
5300                 server->pnfs_blksize = fsinfo->blksize;
5301                 set_pnfs_layoutdriver(server, fhandle, fsinfo);
5302         }
5303
5304         return error;
5305 }
5306
5307 static int _nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
5308                 struct nfs_pathconf *pathconf)
5309 {
5310         struct nfs4_pathconf_arg args = {
5311                 .fh = fhandle,
5312                 .bitmask = server->attr_bitmask,
5313         };
5314         struct nfs4_pathconf_res res = {
5315                 .pathconf = pathconf,
5316         };
5317         struct rpc_message msg = {
5318                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_PATHCONF],
5319                 .rpc_argp = &args,
5320                 .rpc_resp = &res,
5321         };
5322
5323         /* None of the pathconf attributes are mandatory to implement */
5324         if ((args.bitmask[0] & nfs4_pathconf_bitmap[0]) == 0) {
5325                 memset(pathconf, 0, sizeof(*pathconf));
5326                 return 0;
5327         }
5328
5329         nfs_fattr_init(pathconf->fattr);
5330         return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
5331 }
5332
5333 static int nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
5334                 struct nfs_pathconf *pathconf)
5335 {
5336         struct nfs4_exception exception = {
5337                 .interruptible = true,
5338         };
5339         int err;
5340
5341         do {
5342                 err = nfs4_handle_exception(server,
5343                                 _nfs4_proc_pathconf(server, fhandle, pathconf),
5344                                 &exception);
5345         } while (exception.retry);
5346         return err;
5347 }
5348
5349 int nfs4_set_rw_stateid(nfs4_stateid *stateid,
5350                 const struct nfs_open_context *ctx,
5351                 const struct nfs_lock_context *l_ctx,
5352                 fmode_t fmode)
5353 {
5354         return nfs4_select_rw_stateid(ctx->state, fmode, l_ctx, stateid, NULL);
5355 }
5356 EXPORT_SYMBOL_GPL(nfs4_set_rw_stateid);
5357
5358 static bool nfs4_stateid_is_current(nfs4_stateid *stateid,
5359                 const struct nfs_open_context *ctx,
5360                 const struct nfs_lock_context *l_ctx,
5361                 fmode_t fmode)
5362 {
5363         nfs4_stateid _current_stateid;
5364
5365         /* If the current stateid represents a lost lock, then exit */
5366         if (nfs4_set_rw_stateid(&_current_stateid, ctx, l_ctx, fmode) == -EIO)
5367                 return true;
5368         return nfs4_stateid_match(stateid, &_current_stateid);
5369 }
5370
5371 static bool nfs4_error_stateid_expired(int err)
5372 {
5373         switch (err) {
5374         case -NFS4ERR_DELEG_REVOKED:
5375         case -NFS4ERR_ADMIN_REVOKED:
5376         case -NFS4ERR_BAD_STATEID:
5377         case -NFS4ERR_STALE_STATEID:
5378         case -NFS4ERR_OLD_STATEID:
5379         case -NFS4ERR_OPENMODE:
5380         case -NFS4ERR_EXPIRED:
5381                 return true;
5382         }
5383         return false;
5384 }
5385
5386 static int nfs4_read_done_cb(struct rpc_task *task, struct nfs_pgio_header *hdr)
5387 {
5388         struct nfs_server *server = NFS_SERVER(hdr->inode);
5389
5390         trace_nfs4_read(hdr, task->tk_status);
5391         if (task->tk_status < 0) {
5392                 struct nfs4_exception exception = {
5393                         .inode = hdr->inode,
5394                         .state = hdr->args.context->state,
5395                         .stateid = &hdr->args.stateid,
5396                 };
5397                 task->tk_status = nfs4_async_handle_exception(task,
5398                                 server, task->tk_status, &exception);
5399                 if (exception.retry) {
5400                         rpc_restart_call_prepare(task);
5401                         return -EAGAIN;
5402                 }
5403         }
5404
5405         if (task->tk_status > 0)
5406                 renew_lease(server, hdr->timestamp);
5407         return 0;
5408 }
5409
5410 static bool nfs4_read_stateid_changed(struct rpc_task *task,
5411                 struct nfs_pgio_args *args)
5412 {
5413
5414         if (!nfs4_error_stateid_expired(task->tk_status) ||
5415                 nfs4_stateid_is_current(&args->stateid,
5416                                 args->context,
5417                                 args->lock_context,
5418                                 FMODE_READ))
5419                 return false;
5420         rpc_restart_call_prepare(task);
5421         return true;
5422 }
5423
5424 static bool nfs4_read_plus_not_supported(struct rpc_task *task,
5425                                          struct nfs_pgio_header *hdr)
5426 {
5427         struct nfs_server *server = NFS_SERVER(hdr->inode);
5428         struct rpc_message *msg = &task->tk_msg;
5429
5430         if (msg->rpc_proc == &nfs4_procedures[NFSPROC4_CLNT_READ_PLUS] &&
5431             server->caps & NFS_CAP_READ_PLUS && task->tk_status == -ENOTSUPP) {
5432                 server->caps &= ~NFS_CAP_READ_PLUS;
5433                 msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READ];
5434                 rpc_restart_call_prepare(task);
5435                 return true;
5436         }
5437         return false;
5438 }
5439
5440 static int nfs4_read_done(struct rpc_task *task, struct nfs_pgio_header *hdr)
5441 {
5442         if (hdr->res.scratch)
5443                 kfree(hdr->res.scratch);
5444         if (!nfs4_sequence_done(task, &hdr->res.seq_res))
5445                 return -EAGAIN;
5446         if (nfs4_read_stateid_changed(task, &hdr->args))
5447                 return -EAGAIN;
5448         if (nfs4_read_plus_not_supported(task, hdr))
5449                 return -EAGAIN;
5450         if (task->tk_status > 0)
5451                 nfs_invalidate_atime(hdr->inode);
5452         return hdr->pgio_done_cb ? hdr->pgio_done_cb(task, hdr) :
5453                                     nfs4_read_done_cb(task, hdr);
5454 }
5455
5456 #if defined CONFIG_NFS_V4_2 && defined CONFIG_NFS_V4_2_READ_PLUS
5457 static bool nfs42_read_plus_support(struct nfs_pgio_header *hdr,
5458                                     struct rpc_message *msg)
5459 {
5460         /* Note: We don't use READ_PLUS with pNFS yet */
5461         if (nfs_server_capable(hdr->inode, NFS_CAP_READ_PLUS) && !hdr->ds_clp) {
5462                 msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READ_PLUS];
5463                 hdr->res.scratch = kmalloc(32, GFP_KERNEL);
5464                 return hdr->res.scratch != NULL;
5465         }
5466         return false;
5467 }
5468 #else
5469 static bool nfs42_read_plus_support(struct nfs_pgio_header *hdr,
5470                                     struct rpc_message *msg)
5471 {
5472         return false;
5473 }
5474 #endif /* CONFIG_NFS_V4_2 */
5475
5476 static void nfs4_proc_read_setup(struct nfs_pgio_header *hdr,
5477                                  struct rpc_message *msg)
5478 {
5479         hdr->timestamp   = jiffies;
5480         if (!hdr->pgio_done_cb)
5481                 hdr->pgio_done_cb = nfs4_read_done_cb;
5482         if (!nfs42_read_plus_support(hdr, msg))
5483                 msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READ];
5484         nfs4_init_sequence(&hdr->args.seq_args, &hdr->res.seq_res, 0, 0);
5485 }
5486
5487 static int nfs4_proc_pgio_rpc_prepare(struct rpc_task *task,
5488                                       struct nfs_pgio_header *hdr)
5489 {
5490         if (nfs4_setup_sequence(NFS_SERVER(hdr->inode)->nfs_client,
5491                         &hdr->args.seq_args,
5492                         &hdr->res.seq_res,
5493                         task))
5494                 return 0;
5495         if (nfs4_set_rw_stateid(&hdr->args.stateid, hdr->args.context,
5496                                 hdr->args.lock_context,
5497                                 hdr->rw_mode) == -EIO)
5498                 return -EIO;
5499         if (unlikely(test_bit(NFS_CONTEXT_BAD, &hdr->args.context->flags)))
5500                 return -EIO;
5501         return 0;
5502 }
5503
5504 static int nfs4_write_done_cb(struct rpc_task *task,
5505                               struct nfs_pgio_header *hdr)
5506 {
5507         struct inode *inode = hdr->inode;
5508
5509         trace_nfs4_write(hdr, task->tk_status);
5510         if (task->tk_status < 0) {
5511                 struct nfs4_exception exception = {
5512                         .inode = hdr->inode,
5513                         .state = hdr->args.context->state,
5514                         .stateid = &hdr->args.stateid,
5515                 };
5516                 task->tk_status = nfs4_async_handle_exception(task,
5517                                 NFS_SERVER(inode), task->tk_status,
5518                                 &exception);
5519                 if (exception.retry) {
5520                         rpc_restart_call_prepare(task);
5521                         return -EAGAIN;
5522                 }
5523         }
5524         if (task->tk_status >= 0) {
5525                 renew_lease(NFS_SERVER(inode), hdr->timestamp);
5526                 nfs_writeback_update_inode(hdr);
5527         }
5528         return 0;
5529 }
5530
5531 static bool nfs4_write_stateid_changed(struct rpc_task *task,
5532                 struct nfs_pgio_args *args)
5533 {
5534
5535         if (!nfs4_error_stateid_expired(task->tk_status) ||
5536                 nfs4_stateid_is_current(&args->stateid,
5537                                 args->context,
5538                                 args->lock_context,
5539                                 FMODE_WRITE))
5540                 return false;
5541         rpc_restart_call_prepare(task);
5542         return true;
5543 }
5544
5545 static int nfs4_write_done(struct rpc_task *task, struct nfs_pgio_header *hdr)
5546 {
5547         if (!nfs4_sequence_done(task, &hdr->res.seq_res))
5548                 return -EAGAIN;
5549         if (nfs4_write_stateid_changed(task, &hdr->args))
5550                 return -EAGAIN;
5551         return hdr->pgio_done_cb ? hdr->pgio_done_cb(task, hdr) :
5552                 nfs4_write_done_cb(task, hdr);
5553 }
5554
5555 static
5556 bool nfs4_write_need_cache_consistency_data(struct nfs_pgio_header *hdr)
5557 {
5558         /* Don't request attributes for pNFS or O_DIRECT writes */
5559         if (hdr->ds_clp != NULL || hdr->dreq != NULL)
5560                 return false;
5561         /* Otherwise, request attributes if and only if we don't hold
5562          * a delegation
5563          */
5564         return nfs4_have_delegation(hdr->inode, FMODE_READ) == 0;
5565 }
5566
5567 void nfs4_bitmask_set(__u32 bitmask[], const __u32 src[],
5568                       struct inode *inode, unsigned long cache_validity)
5569 {
5570         struct nfs_server *server = NFS_SERVER(inode);
5571         unsigned int i;
5572
5573         memcpy(bitmask, src, sizeof(*bitmask) * NFS4_BITMASK_SZ);
5574         cache_validity |= READ_ONCE(NFS_I(inode)->cache_validity);
5575
5576         if (cache_validity & NFS_INO_INVALID_CHANGE)
5577                 bitmask[0] |= FATTR4_WORD0_CHANGE;
5578         if (cache_validity & NFS_INO_INVALID_ATIME)
5579                 bitmask[1] |= FATTR4_WORD1_TIME_ACCESS;
5580         if (cache_validity & NFS_INO_INVALID_MODE)
5581                 bitmask[1] |= FATTR4_WORD1_MODE;
5582         if (cache_validity & NFS_INO_INVALID_OTHER)
5583                 bitmask[1] |= FATTR4_WORD1_OWNER | FATTR4_WORD1_OWNER_GROUP;
5584         if (cache_validity & NFS_INO_INVALID_NLINK)
5585                 bitmask[1] |= FATTR4_WORD1_NUMLINKS;
5586         if (cache_validity & NFS_INO_INVALID_CTIME)
5587                 bitmask[1] |= FATTR4_WORD1_TIME_METADATA;
5588         if (cache_validity & NFS_INO_INVALID_MTIME)
5589                 bitmask[1] |= FATTR4_WORD1_TIME_MODIFY;
5590         if (cache_validity & NFS_INO_INVALID_BLOCKS)
5591                 bitmask[1] |= FATTR4_WORD1_SPACE_USED;
5592
5593         if (cache_validity & NFS_INO_INVALID_SIZE)
5594                 bitmask[0] |= FATTR4_WORD0_SIZE;
5595
5596         for (i = 0; i < NFS4_BITMASK_SZ; i++)
5597                 bitmask[i] &= server->attr_bitmask[i];
5598 }
5599
5600 static void nfs4_proc_write_setup(struct nfs_pgio_header *hdr,
5601                                   struct rpc_message *msg,
5602                                   struct rpc_clnt **clnt)
5603 {
5604         struct nfs_server *server = NFS_SERVER(hdr->inode);
5605
5606         if (!nfs4_write_need_cache_consistency_data(hdr)) {
5607                 hdr->args.bitmask = NULL;
5608                 hdr->res.fattr = NULL;
5609         } else {
5610                 nfs4_bitmask_set(hdr->args.bitmask_store,
5611                                  server->cache_consistency_bitmask,
5612                                  hdr->inode, NFS_INO_INVALID_BLOCKS);
5613                 hdr->args.bitmask = hdr->args.bitmask_store;
5614         }
5615
5616         if (!hdr->pgio_done_cb)
5617                 hdr->pgio_done_cb = nfs4_write_done_cb;
5618         hdr->res.server = server;
5619         hdr->timestamp   = jiffies;
5620
5621         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_WRITE];
5622         nfs4_init_sequence(&hdr->args.seq_args, &hdr->res.seq_res, 0, 0);
5623         nfs4_state_protect_write(server->nfs_client, clnt, msg, hdr);
5624 }
5625
5626 static void nfs4_proc_commit_rpc_prepare(struct rpc_task *task, struct nfs_commit_data *data)
5627 {
5628         nfs4_setup_sequence(NFS_SERVER(data->inode)->nfs_client,
5629                         &data->args.seq_args,
5630                         &data->res.seq_res,
5631                         task);
5632 }
5633
5634 static int nfs4_commit_done_cb(struct rpc_task *task, struct nfs_commit_data *data)
5635 {
5636         struct inode *inode = data->inode;
5637
5638         trace_nfs4_commit(data, task->tk_status);
5639         if (nfs4_async_handle_error(task, NFS_SERVER(inode),
5640                                     NULL, NULL) == -EAGAIN) {
5641                 rpc_restart_call_prepare(task);
5642                 return -EAGAIN;
5643         }
5644         return 0;
5645 }
5646
5647 static int nfs4_commit_done(struct rpc_task *task, struct nfs_commit_data *data)
5648 {
5649         if (!nfs4_sequence_done(task, &data->res.seq_res))
5650                 return -EAGAIN;
5651         return data->commit_done_cb(task, data);
5652 }
5653
5654 static void nfs4_proc_commit_setup(struct nfs_commit_data *data, struct rpc_message *msg,
5655                                    struct rpc_clnt **clnt)
5656 {
5657         struct nfs_server *server = NFS_SERVER(data->inode);
5658
5659         if (data->commit_done_cb == NULL)
5660                 data->commit_done_cb = nfs4_commit_done_cb;
5661         data->res.server = server;
5662         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_COMMIT];
5663         nfs4_init_sequence(&data->args.seq_args, &data->res.seq_res, 1, 0);
5664         nfs4_state_protect(server->nfs_client, NFS_SP4_MACH_CRED_COMMIT, clnt, msg);
5665 }
5666
5667 static int _nfs4_proc_commit(struct file *dst, struct nfs_commitargs *args,
5668                                 struct nfs_commitres *res)
5669 {
5670         struct inode *dst_inode = file_inode(dst);
5671         struct nfs_server *server = NFS_SERVER(dst_inode);
5672         struct rpc_message msg = {
5673                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_COMMIT],
5674                 .rpc_argp = args,
5675                 .rpc_resp = res,
5676         };
5677
5678         args->fh = NFS_FH(dst_inode);
5679         return nfs4_call_sync(server->client, server, &msg,
5680                         &args->seq_args, &res->seq_res, 1);
5681 }
5682
5683 int nfs4_proc_commit(struct file *dst, __u64 offset, __u32 count, struct nfs_commitres *res)
5684 {
5685         struct nfs_commitargs args = {
5686                 .offset = offset,
5687                 .count = count,
5688         };
5689         struct nfs_server *dst_server = NFS_SERVER(file_inode(dst));
5690         struct nfs4_exception exception = { };
5691         int status;
5692
5693         do {
5694                 status = _nfs4_proc_commit(dst, &args, res);
5695                 status = nfs4_handle_exception(dst_server, status, &exception);
5696         } while (exception.retry);
5697
5698         return status;
5699 }
5700
5701 struct nfs4_renewdata {
5702         struct nfs_client       *client;
5703         unsigned long           timestamp;
5704 };
5705
5706 /*
5707  * nfs4_proc_async_renew(): This is not one of the nfs_rpc_ops; it is a special
5708  * standalone procedure for queueing an asynchronous RENEW.
5709  */
5710 static void nfs4_renew_release(void *calldata)
5711 {
5712         struct nfs4_renewdata *data = calldata;
5713         struct nfs_client *clp = data->client;
5714
5715         if (refcount_read(&clp->cl_count) > 1)
5716                 nfs4_schedule_state_renewal(clp);
5717         nfs_put_client(clp);
5718         kfree(data);
5719 }
5720
5721 static void nfs4_renew_done(struct rpc_task *task, void *calldata)
5722 {
5723         struct nfs4_renewdata *data = calldata;
5724         struct nfs_client *clp = data->client;
5725         unsigned long timestamp = data->timestamp;
5726
5727         trace_nfs4_renew_async(clp, task->tk_status);
5728         switch (task->tk_status) {
5729         case 0:
5730                 break;
5731         case -NFS4ERR_LEASE_MOVED:
5732                 nfs4_schedule_lease_moved_recovery(clp);
5733                 break;
5734         default:
5735                 /* Unless we're shutting down, schedule state recovery! */
5736                 if (test_bit(NFS_CS_RENEWD, &clp->cl_res_state) == 0)
5737                         return;
5738                 if (task->tk_status != NFS4ERR_CB_PATH_DOWN) {
5739                         nfs4_schedule_lease_recovery(clp);
5740                         return;
5741                 }
5742                 nfs4_schedule_path_down_recovery(clp);
5743         }
5744         do_renew_lease(clp, timestamp);
5745 }
5746
5747 static const struct rpc_call_ops nfs4_renew_ops = {
5748         .rpc_call_done = nfs4_renew_done,
5749         .rpc_release = nfs4_renew_release,
5750 };
5751
5752 static int nfs4_proc_async_renew(struct nfs_client *clp, const struct cred *cred, unsigned renew_flags)
5753 {
5754         struct rpc_message msg = {
5755                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_RENEW],
5756                 .rpc_argp       = clp,
5757                 .rpc_cred       = cred,
5758         };
5759         struct nfs4_renewdata *data;
5760
5761         if (renew_flags == 0)
5762                 return 0;
5763         if (!refcount_inc_not_zero(&clp->cl_count))
5764                 return -EIO;
5765         data = kmalloc(sizeof(*data), GFP_NOFS);
5766         if (data == NULL) {
5767                 nfs_put_client(clp);
5768                 return -ENOMEM;
5769         }
5770         data->client = clp;
5771         data->timestamp = jiffies;
5772         return rpc_call_async(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT,
5773                         &nfs4_renew_ops, data);
5774 }
5775
5776 static int nfs4_proc_renew(struct nfs_client *clp, const struct cred *cred)
5777 {
5778         struct rpc_message msg = {
5779                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_RENEW],
5780                 .rpc_argp       = clp,
5781                 .rpc_cred       = cred,
5782         };
5783         unsigned long now = jiffies;
5784         int status;
5785
5786         status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
5787         if (status < 0)
5788                 return status;
5789         do_renew_lease(clp, now);
5790         return 0;
5791 }
5792
5793 static bool nfs4_server_supports_acls(const struct nfs_server *server,
5794                                       enum nfs4_acl_type type)
5795 {
5796         switch (type) {
5797         default:
5798                 return server->attr_bitmask[0] & FATTR4_WORD0_ACL;
5799         case NFS4ACL_DACL:
5800                 return server->attr_bitmask[1] & FATTR4_WORD1_DACL;
5801         case NFS4ACL_SACL:
5802                 return server->attr_bitmask[1] & FATTR4_WORD1_SACL;
5803         }
5804 }
5805
5806 /* Assuming that XATTR_SIZE_MAX is a multiple of PAGE_SIZE, and that
5807  * it's OK to put sizeof(void) * (XATTR_SIZE_MAX/PAGE_SIZE) bytes on
5808  * the stack.
5809  */
5810 #define NFS4ACL_MAXPAGES DIV_ROUND_UP(XATTR_SIZE_MAX, PAGE_SIZE)
5811
5812 int nfs4_buf_to_pages_noslab(const void *buf, size_t buflen,
5813                 struct page **pages)
5814 {
5815         struct page *newpage, **spages;
5816         int rc = 0;
5817         size_t len;
5818         spages = pages;
5819
5820         do {
5821                 len = min_t(size_t, PAGE_SIZE, buflen);
5822                 newpage = alloc_page(GFP_KERNEL);
5823
5824                 if (newpage == NULL)
5825                         goto unwind;
5826                 memcpy(page_address(newpage), buf, len);
5827                 buf += len;
5828                 buflen -= len;
5829                 *pages++ = newpage;
5830                 rc++;
5831         } while (buflen != 0);
5832
5833         return rc;
5834
5835 unwind:
5836         for(; rc > 0; rc--)
5837                 __free_page(spages[rc-1]);
5838         return -ENOMEM;
5839 }
5840
5841 struct nfs4_cached_acl {
5842         enum nfs4_acl_type type;
5843         int cached;
5844         size_t len;
5845         char data[];
5846 };
5847
5848 static void nfs4_set_cached_acl(struct inode *inode, struct nfs4_cached_acl *acl)
5849 {
5850         struct nfs_inode *nfsi = NFS_I(inode);
5851
5852         spin_lock(&inode->i_lock);
5853         kfree(nfsi->nfs4_acl);
5854         nfsi->nfs4_acl = acl;
5855         spin_unlock(&inode->i_lock);
5856 }
5857
5858 static void nfs4_zap_acl_attr(struct inode *inode)
5859 {
5860         nfs4_set_cached_acl(inode, NULL);
5861 }
5862
5863 static ssize_t nfs4_read_cached_acl(struct inode *inode, char *buf,
5864                                     size_t buflen, enum nfs4_acl_type type)
5865 {
5866         struct nfs_inode *nfsi = NFS_I(inode);
5867         struct nfs4_cached_acl *acl;
5868         int ret = -ENOENT;
5869
5870         spin_lock(&inode->i_lock);
5871         acl = nfsi->nfs4_acl;
5872         if (acl == NULL)
5873                 goto out;
5874         if (acl->type != type)
5875                 goto out;
5876         if (buf == NULL) /* user is just asking for length */
5877                 goto out_len;
5878         if (acl->cached == 0)
5879                 goto out;
5880         ret = -ERANGE; /* see getxattr(2) man page */
5881         if (acl->len > buflen)
5882                 goto out;
5883         memcpy(buf, acl->data, acl->len);
5884 out_len:
5885         ret = acl->len;
5886 out:
5887         spin_unlock(&inode->i_lock);
5888         return ret;
5889 }
5890
5891 static void nfs4_write_cached_acl(struct inode *inode, struct page **pages,
5892                                   size_t pgbase, size_t acl_len,
5893                                   enum nfs4_acl_type type)
5894 {
5895         struct nfs4_cached_acl *acl;
5896         size_t buflen = sizeof(*acl) + acl_len;
5897
5898         if (buflen <= PAGE_SIZE) {
5899                 acl = kmalloc(buflen, GFP_KERNEL);
5900                 if (acl == NULL)
5901                         goto out;
5902                 acl->cached = 1;
5903                 _copy_from_pages(acl->data, pages, pgbase, acl_len);
5904         } else {
5905                 acl = kmalloc(sizeof(*acl), GFP_KERNEL);
5906                 if (acl == NULL)
5907                         goto out;
5908                 acl->cached = 0;
5909         }
5910         acl->type = type;
5911         acl->len = acl_len;
5912 out:
5913         nfs4_set_cached_acl(inode, acl);
5914 }
5915
5916 /*
5917  * The getxattr API returns the required buffer length when called with a
5918  * NULL buf. The NFSv4 acl tool then calls getxattr again after allocating
5919  * the required buf.  On a NULL buf, we send a page of data to the server
5920  * guessing that the ACL request can be serviced by a page. If so, we cache
5921  * up to the page of ACL data, and the 2nd call to getxattr is serviced by
5922  * the cache. If not so, we throw away the page, and cache the required
5923  * length. The next getxattr call will then produce another round trip to
5924  * the server, this time with the input buf of the required size.
5925  */
5926 static ssize_t __nfs4_get_acl_uncached(struct inode *inode, void *buf,
5927                                        size_t buflen, enum nfs4_acl_type type)
5928 {
5929         struct page **pages;
5930         struct nfs_getaclargs args = {
5931                 .fh = NFS_FH(inode),
5932                 .acl_type = type,
5933                 .acl_len = buflen,
5934         };
5935         struct nfs_getaclres res = {
5936                 .acl_type = type,
5937                 .acl_len = buflen,
5938         };
5939         struct rpc_message msg = {
5940                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETACL],
5941                 .rpc_argp = &args,
5942                 .rpc_resp = &res,
5943         };
5944         unsigned int npages;
5945         int ret = -ENOMEM, i;
5946         struct nfs_server *server = NFS_SERVER(inode);
5947
5948         if (buflen == 0)
5949                 buflen = server->rsize;
5950
5951         npages = DIV_ROUND_UP(buflen, PAGE_SIZE) + 1;
5952         pages = kmalloc_array(npages, sizeof(struct page *), GFP_KERNEL);
5953         if (!pages)
5954                 return -ENOMEM;
5955
5956         args.acl_pages = pages;
5957
5958         for (i = 0; i < npages; i++) {
5959                 pages[i] = alloc_page(GFP_KERNEL);
5960                 if (!pages[i])
5961                         goto out_free;
5962         }
5963
5964         /* for decoding across pages */
5965         res.acl_scratch = alloc_page(GFP_KERNEL);
5966         if (!res.acl_scratch)
5967                 goto out_free;
5968
5969         args.acl_len = npages * PAGE_SIZE;
5970
5971         dprintk("%s  buf %p buflen %zu npages %d args.acl_len %zu\n",
5972                 __func__, buf, buflen, npages, args.acl_len);
5973         ret = nfs4_call_sync(NFS_SERVER(inode)->client, NFS_SERVER(inode),
5974                              &msg, &args.seq_args, &res.seq_res, 0);
5975         if (ret)
5976                 goto out_free;
5977
5978         /* Handle the case where the passed-in buffer is too short */
5979         if (res.acl_flags & NFS4_ACL_TRUNC) {
5980                 /* Did the user only issue a request for the acl length? */
5981                 if (buf == NULL)
5982                         goto out_ok;
5983                 ret = -ERANGE;
5984                 goto out_free;
5985         }
5986         nfs4_write_cached_acl(inode, pages, res.acl_data_offset, res.acl_len,
5987                               type);
5988         if (buf) {
5989                 if (res.acl_len > buflen) {
5990                         ret = -ERANGE;
5991                         goto out_free;
5992                 }
5993                 _copy_from_pages(buf, pages, res.acl_data_offset, res.acl_len);
5994         }
5995 out_ok:
5996         ret = res.acl_len;
5997 out_free:
5998         for (i = 0; i < npages; i++)
5999                 if (pages[i])
6000                         __free_page(pages[i]);
6001         if (res.acl_scratch)
6002                 __free_page(res.acl_scratch);
6003         kfree(pages);
6004         return ret;
6005 }
6006
6007 static ssize_t nfs4_get_acl_uncached(struct inode *inode, void *buf,
6008                                      size_t buflen, enum nfs4_acl_type type)
6009 {
6010         struct nfs4_exception exception = {
6011                 .interruptible = true,
6012         };
6013         ssize_t ret;
6014         do {
6015                 ret = __nfs4_get_acl_uncached(inode, buf, buflen, type);
6016                 trace_nfs4_get_acl(inode, ret);
6017                 if (ret >= 0)
6018                         break;
6019                 ret = nfs4_handle_exception(NFS_SERVER(inode), ret, &exception);
6020         } while (exception.retry);
6021         return ret;
6022 }
6023
6024 static ssize_t nfs4_proc_get_acl(struct inode *inode, void *buf, size_t buflen,
6025                                  enum nfs4_acl_type type)
6026 {
6027         struct nfs_server *server = NFS_SERVER(inode);
6028         int ret;
6029
6030         if (!nfs4_server_supports_acls(server, type))
6031                 return -EOPNOTSUPP;
6032         ret = nfs_revalidate_inode(inode, NFS_INO_INVALID_CHANGE);
6033         if (ret < 0)
6034                 return ret;
6035         if (NFS_I(inode)->cache_validity & NFS_INO_INVALID_ACL)
6036                 nfs_zap_acl_cache(inode);
6037         ret = nfs4_read_cached_acl(inode, buf, buflen, type);
6038         if (ret != -ENOENT)
6039                 /* -ENOENT is returned if there is no ACL or if there is an ACL
6040                  * but no cached acl data, just the acl length */
6041                 return ret;
6042         return nfs4_get_acl_uncached(inode, buf, buflen, type);
6043 }
6044
6045 static int __nfs4_proc_set_acl(struct inode *inode, const void *buf,
6046                                size_t buflen, enum nfs4_acl_type type)
6047 {
6048         struct nfs_server *server = NFS_SERVER(inode);
6049         struct page *pages[NFS4ACL_MAXPAGES];
6050         struct nfs_setaclargs arg = {
6051                 .fh = NFS_FH(inode),
6052                 .acl_type = type,
6053                 .acl_len = buflen,
6054                 .acl_pages = pages,
6055         };
6056         struct nfs_setaclres res;
6057         struct rpc_message msg = {
6058                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_SETACL],
6059                 .rpc_argp       = &arg,
6060                 .rpc_resp       = &res,
6061         };
6062         unsigned int npages = DIV_ROUND_UP(buflen, PAGE_SIZE);
6063         int ret, i;
6064
6065         /* You can't remove system.nfs4_acl: */
6066         if (buflen == 0)
6067                 return -EINVAL;
6068         if (!nfs4_server_supports_acls(server, type))
6069                 return -EOPNOTSUPP;
6070         if (npages > ARRAY_SIZE(pages))
6071                 return -ERANGE;
6072         i = nfs4_buf_to_pages_noslab(buf, buflen, arg.acl_pages);
6073         if (i < 0)
6074                 return i;
6075         nfs4_inode_make_writeable(inode);
6076         ret = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
6077
6078         /*
6079          * Free each page after tx, so the only ref left is
6080          * held by the network stack
6081          */
6082         for (; i > 0; i--)
6083                 put_page(pages[i-1]);
6084
6085         /*
6086          * Acl update can result in inode attribute update.
6087          * so mark the attribute cache invalid.
6088          */
6089         spin_lock(&inode->i_lock);
6090         nfs_set_cache_invalid(inode, NFS_INO_INVALID_CHANGE |
6091                                              NFS_INO_INVALID_CTIME |
6092                                              NFS_INO_REVAL_FORCED);
6093         spin_unlock(&inode->i_lock);
6094         nfs_access_zap_cache(inode);
6095         nfs_zap_acl_cache(inode);
6096         return ret;
6097 }
6098
6099 static int nfs4_proc_set_acl(struct inode *inode, const void *buf,
6100                              size_t buflen, enum nfs4_acl_type type)
6101 {
6102         struct nfs4_exception exception = { };
6103         int err;
6104         do {
6105                 err = __nfs4_proc_set_acl(inode, buf, buflen, type);
6106                 trace_nfs4_set_acl(inode, err);
6107                 if (err == -NFS4ERR_BADOWNER || err == -NFS4ERR_BADNAME) {
6108                         /*
6109                          * no need to retry since the kernel
6110                          * isn't involved in encoding the ACEs.
6111                          */
6112                         err = -EINVAL;
6113                         break;
6114                 }
6115                 err = nfs4_handle_exception(NFS_SERVER(inode), err,
6116                                 &exception);
6117         } while (exception.retry);
6118         return err;
6119 }
6120
6121 #ifdef CONFIG_NFS_V4_SECURITY_LABEL
6122 static int _nfs4_get_security_label(struct inode *inode, void *buf,
6123                                         size_t buflen)
6124 {
6125         struct nfs_server *server = NFS_SERVER(inode);
6126         struct nfs4_label label = {0, 0, buflen, buf};
6127
6128         u32 bitmask[3] = { 0, 0, FATTR4_WORD2_SECURITY_LABEL };
6129         struct nfs_fattr fattr = {
6130                 .label = &label,
6131         };
6132         struct nfs4_getattr_arg arg = {
6133                 .fh             = NFS_FH(inode),
6134                 .bitmask        = bitmask,
6135         };
6136         struct nfs4_getattr_res res = {
6137                 .fattr          = &fattr,
6138                 .server         = server,
6139         };
6140         struct rpc_message msg = {
6141                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_GETATTR],
6142                 .rpc_argp       = &arg,
6143                 .rpc_resp       = &res,
6144         };
6145         int ret;
6146
6147         nfs_fattr_init(&fattr);
6148
6149         ret = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 0);
6150         if (ret)
6151                 return ret;
6152         if (!(fattr.valid & NFS_ATTR_FATTR_V4_SECURITY_LABEL))
6153                 return -ENOENT;
6154         return label.len;
6155 }
6156
6157 static int nfs4_get_security_label(struct inode *inode, void *buf,
6158                                         size_t buflen)
6159 {
6160         struct nfs4_exception exception = {
6161                 .interruptible = true,
6162         };
6163         int err;
6164
6165         if (!nfs_server_capable(inode, NFS_CAP_SECURITY_LABEL))
6166                 return -EOPNOTSUPP;
6167
6168         do {
6169                 err = _nfs4_get_security_label(inode, buf, buflen);
6170                 trace_nfs4_get_security_label(inode, err);
6171                 err = nfs4_handle_exception(NFS_SERVER(inode), err,
6172                                 &exception);
6173         } while (exception.retry);
6174         return err;
6175 }
6176
6177 static int _nfs4_do_set_security_label(struct inode *inode,
6178                 struct nfs4_label *ilabel,
6179                 struct nfs_fattr *fattr)
6180 {
6181
6182         struct iattr sattr = {0};
6183         struct nfs_server *server = NFS_SERVER(inode);
6184         const u32 bitmask[3] = { 0, 0, FATTR4_WORD2_SECURITY_LABEL };
6185         struct nfs_setattrargs arg = {
6186                 .fh             = NFS_FH(inode),
6187                 .iap            = &sattr,
6188                 .server         = server,
6189                 .bitmask        = bitmask,
6190                 .label          = ilabel,
6191         };
6192         struct nfs_setattrres res = {
6193                 .fattr          = fattr,
6194                 .server         = server,
6195         };
6196         struct rpc_message msg = {
6197                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_SETATTR],
6198                 .rpc_argp       = &arg,
6199                 .rpc_resp       = &res,
6200         };
6201         int status;
6202
6203         nfs4_stateid_copy(&arg.stateid, &zero_stateid);
6204
6205         status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
6206         if (status)
6207                 dprintk("%s failed: %d\n", __func__, status);
6208
6209         return status;
6210 }
6211
6212 static int nfs4_do_set_security_label(struct inode *inode,
6213                 struct nfs4_label *ilabel,
6214                 struct nfs_fattr *fattr)
6215 {
6216         struct nfs4_exception exception = { };
6217         int err;
6218
6219         do {
6220                 err = _nfs4_do_set_security_label(inode, ilabel, fattr);
6221                 trace_nfs4_set_security_label(inode, err);
6222                 err = nfs4_handle_exception(NFS_SERVER(inode), err,
6223                                 &exception);
6224         } while (exception.retry);
6225         return err;
6226 }
6227
6228 static int
6229 nfs4_set_security_label(struct inode *inode, const void *buf, size_t buflen)
6230 {
6231         struct nfs4_label ilabel = {0, 0, buflen, (char *)buf };
6232         struct nfs_fattr *fattr;
6233         int status;
6234
6235         if (!nfs_server_capable(inode, NFS_CAP_SECURITY_LABEL))
6236                 return -EOPNOTSUPP;
6237
6238         fattr = nfs_alloc_fattr_with_label(NFS_SERVER(inode));
6239         if (fattr == NULL)
6240                 return -ENOMEM;
6241
6242         status = nfs4_do_set_security_label(inode, &ilabel, fattr);
6243         if (status == 0)
6244                 nfs_setsecurity(inode, fattr);
6245
6246         return status;
6247 }
6248 #endif  /* CONFIG_NFS_V4_SECURITY_LABEL */
6249
6250
6251 static void nfs4_init_boot_verifier(const struct nfs_client *clp,
6252                                     nfs4_verifier *bootverf)
6253 {
6254         __be32 verf[2];
6255
6256         if (test_bit(NFS4CLNT_PURGE_STATE, &clp->cl_state)) {
6257                 /* An impossible timestamp guarantees this value
6258                  * will never match a generated boot time. */
6259                 verf[0] = cpu_to_be32(U32_MAX);
6260                 verf[1] = cpu_to_be32(U32_MAX);
6261         } else {
6262                 struct nfs_net *nn = net_generic(clp->cl_net, nfs_net_id);
6263                 u64 ns = ktime_to_ns(nn->boot_time);
6264
6265                 verf[0] = cpu_to_be32(ns >> 32);
6266                 verf[1] = cpu_to_be32(ns);
6267         }
6268         memcpy(bootverf->data, verf, sizeof(bootverf->data));
6269 }
6270
6271 static size_t
6272 nfs4_get_uniquifier(struct nfs_client *clp, char *buf, size_t buflen)
6273 {
6274         struct nfs_net *nn = net_generic(clp->cl_net, nfs_net_id);
6275         struct nfs_netns_client *nn_clp = nn->nfs_client;
6276         const char *id;
6277
6278         buf[0] = '\0';
6279
6280         if (nn_clp) {
6281                 rcu_read_lock();
6282                 id = rcu_dereference(nn_clp->identifier);
6283                 if (id)
6284                         strscpy(buf, id, buflen);
6285                 rcu_read_unlock();
6286         }
6287
6288         if (nfs4_client_id_uniquifier[0] != '\0' && buf[0] == '\0')
6289                 strscpy(buf, nfs4_client_id_uniquifier, buflen);
6290
6291         return strlen(buf);
6292 }
6293
6294 static int
6295 nfs4_init_nonuniform_client_string(struct nfs_client *clp)
6296 {
6297         char buf[NFS4_CLIENT_ID_UNIQ_LEN];
6298         size_t buflen;
6299         size_t len;
6300         char *str;
6301
6302         if (clp->cl_owner_id != NULL)
6303                 return 0;
6304
6305         rcu_read_lock();
6306         len = 14 +
6307                 strlen(clp->cl_rpcclient->cl_nodename) +
6308                 1 +
6309                 strlen(rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_ADDR)) +
6310                 1;
6311         rcu_read_unlock();
6312
6313         buflen = nfs4_get_uniquifier(clp, buf, sizeof(buf));
6314         if (buflen)
6315                 len += buflen + 1;
6316
6317         if (len > NFS4_OPAQUE_LIMIT + 1)
6318                 return -EINVAL;
6319
6320         /*
6321          * Since this string is allocated at mount time, and held until the
6322          * nfs_client is destroyed, we can use GFP_KERNEL here w/o worrying
6323          * about a memory-reclaim deadlock.
6324          */
6325         str = kmalloc(len, GFP_KERNEL);
6326         if (!str)
6327                 return -ENOMEM;
6328
6329         rcu_read_lock();
6330         if (buflen)
6331                 scnprintf(str, len, "Linux NFSv4.0 %s/%s/%s",
6332                           clp->cl_rpcclient->cl_nodename, buf,
6333                           rpc_peeraddr2str(clp->cl_rpcclient,
6334                                            RPC_DISPLAY_ADDR));
6335         else
6336                 scnprintf(str, len, "Linux NFSv4.0 %s/%s",
6337                           clp->cl_rpcclient->cl_nodename,
6338                           rpc_peeraddr2str(clp->cl_rpcclient,
6339                                            RPC_DISPLAY_ADDR));
6340         rcu_read_unlock();
6341
6342         clp->cl_owner_id = str;
6343         return 0;
6344 }
6345
6346 static int
6347 nfs4_init_uniform_client_string(struct nfs_client *clp)
6348 {
6349         char buf[NFS4_CLIENT_ID_UNIQ_LEN];
6350         size_t buflen;
6351         size_t len;
6352         char *str;
6353
6354         if (clp->cl_owner_id != NULL)
6355                 return 0;
6356
6357         len = 10 + 10 + 1 + 10 + 1 +
6358                 strlen(clp->cl_rpcclient->cl_nodename) + 1;
6359
6360         buflen = nfs4_get_uniquifier(clp, buf, sizeof(buf));
6361         if (buflen)
6362                 len += buflen + 1;
6363
6364         if (len > NFS4_OPAQUE_LIMIT + 1)
6365                 return -EINVAL;
6366
6367         /*
6368          * Since this string is allocated at mount time, and held until the
6369          * nfs_client is destroyed, we can use GFP_KERNEL here w/o worrying
6370          * about a memory-reclaim deadlock.
6371          */
6372         str = kmalloc(len, GFP_KERNEL);
6373         if (!str)
6374                 return -ENOMEM;
6375
6376         if (buflen)
6377                 scnprintf(str, len, "Linux NFSv%u.%u %s/%s",
6378                           clp->rpc_ops->version, clp->cl_minorversion,
6379                           buf, clp->cl_rpcclient->cl_nodename);
6380         else
6381                 scnprintf(str, len, "Linux NFSv%u.%u %s",
6382                           clp->rpc_ops->version, clp->cl_minorversion,
6383                           clp->cl_rpcclient->cl_nodename);
6384         clp->cl_owner_id = str;
6385         return 0;
6386 }
6387
6388 /*
6389  * nfs4_callback_up_net() starts only "tcp" and "tcp6" callback
6390  * services.  Advertise one based on the address family of the
6391  * clientaddr.
6392  */
6393 static unsigned int
6394 nfs4_init_callback_netid(const struct nfs_client *clp, char *buf, size_t len)
6395 {
6396         if (strchr(clp->cl_ipaddr, ':') != NULL)
6397                 return scnprintf(buf, len, "tcp6");
6398         else
6399                 return scnprintf(buf, len, "tcp");
6400 }
6401
6402 static void nfs4_setclientid_done(struct rpc_task *task, void *calldata)
6403 {
6404         struct nfs4_setclientid *sc = calldata;
6405
6406         if (task->tk_status == 0)
6407                 sc->sc_cred = get_rpccred(task->tk_rqstp->rq_cred);
6408 }
6409
6410 static const struct rpc_call_ops nfs4_setclientid_ops = {
6411         .rpc_call_done = nfs4_setclientid_done,
6412 };
6413
6414 /**
6415  * nfs4_proc_setclientid - Negotiate client ID
6416  * @clp: state data structure
6417  * @program: RPC program for NFSv4 callback service
6418  * @port: IP port number for NFS4 callback service
6419  * @cred: credential to use for this call
6420  * @res: where to place the result
6421  *
6422  * Returns zero, a negative errno, or a negative NFS4ERR status code.
6423  */
6424 int nfs4_proc_setclientid(struct nfs_client *clp, u32 program,
6425                 unsigned short port, const struct cred *cred,
6426                 struct nfs4_setclientid_res *res)
6427 {
6428         nfs4_verifier sc_verifier;
6429         struct nfs4_setclientid setclientid = {
6430                 .sc_verifier = &sc_verifier,
6431                 .sc_prog = program,
6432                 .sc_clnt = clp,
6433         };
6434         struct rpc_message msg = {
6435                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID],
6436                 .rpc_argp = &setclientid,
6437                 .rpc_resp = res,
6438                 .rpc_cred = cred,
6439         };
6440         struct rpc_task_setup task_setup_data = {
6441                 .rpc_client = clp->cl_rpcclient,
6442                 .rpc_message = &msg,
6443                 .callback_ops = &nfs4_setclientid_ops,
6444                 .callback_data = &setclientid,
6445                 .flags = RPC_TASK_TIMEOUT | RPC_TASK_NO_ROUND_ROBIN,
6446         };
6447         unsigned long now = jiffies;
6448         int status;
6449
6450         /* nfs_client_id4 */
6451         nfs4_init_boot_verifier(clp, &sc_verifier);
6452
6453         if (test_bit(NFS_CS_MIGRATION, &clp->cl_flags))
6454                 status = nfs4_init_uniform_client_string(clp);
6455         else
6456                 status = nfs4_init_nonuniform_client_string(clp);
6457
6458         if (status)
6459                 goto out;
6460
6461         /* cb_client4 */
6462         setclientid.sc_netid_len =
6463                                 nfs4_init_callback_netid(clp,
6464                                                 setclientid.sc_netid,
6465                                                 sizeof(setclientid.sc_netid));
6466         setclientid.sc_uaddr_len = scnprintf(setclientid.sc_uaddr,
6467                                 sizeof(setclientid.sc_uaddr), "%s.%u.%u",
6468                                 clp->cl_ipaddr, port >> 8, port & 255);
6469
6470         dprintk("NFS call  setclientid auth=%s, '%s'\n",
6471                 clp->cl_rpcclient->cl_auth->au_ops->au_name,
6472                 clp->cl_owner_id);
6473
6474         status = nfs4_call_sync_custom(&task_setup_data);
6475         if (setclientid.sc_cred) {
6476                 kfree(clp->cl_acceptor);
6477                 clp->cl_acceptor = rpcauth_stringify_acceptor(setclientid.sc_cred);
6478                 put_rpccred(setclientid.sc_cred);
6479         }
6480
6481         if (status == 0)
6482                 do_renew_lease(clp, now);
6483 out:
6484         trace_nfs4_setclientid(clp, status);
6485         dprintk("NFS reply setclientid: %d\n", status);
6486         return status;
6487 }
6488
6489 /**
6490  * nfs4_proc_setclientid_confirm - Confirm client ID
6491  * @clp: state data structure
6492  * @arg: result of a previous SETCLIENTID
6493  * @cred: credential to use for this call
6494  *
6495  * Returns zero, a negative errno, or a negative NFS4ERR status code.
6496  */
6497 int nfs4_proc_setclientid_confirm(struct nfs_client *clp,
6498                 struct nfs4_setclientid_res *arg,
6499                 const struct cred *cred)
6500 {
6501         struct rpc_message msg = {
6502                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID_CONFIRM],
6503                 .rpc_argp = arg,
6504                 .rpc_cred = cred,
6505         };
6506         int status;
6507
6508         dprintk("NFS call  setclientid_confirm auth=%s, (client ID %llx)\n",
6509                 clp->cl_rpcclient->cl_auth->au_ops->au_name,
6510                 clp->cl_clientid);
6511         status = rpc_call_sync(clp->cl_rpcclient, &msg,
6512                                RPC_TASK_TIMEOUT | RPC_TASK_NO_ROUND_ROBIN);
6513         trace_nfs4_setclientid_confirm(clp, status);
6514         dprintk("NFS reply setclientid_confirm: %d\n", status);
6515         return status;
6516 }
6517
6518 struct nfs4_delegreturndata {
6519         struct nfs4_delegreturnargs args;
6520         struct nfs4_delegreturnres res;
6521         struct nfs_fh fh;
6522         nfs4_stateid stateid;
6523         unsigned long timestamp;
6524         struct {
6525                 struct nfs4_layoutreturn_args arg;
6526                 struct nfs4_layoutreturn_res res;
6527                 struct nfs4_xdr_opaque_data ld_private;
6528                 u32 roc_barrier;
6529                 bool roc;
6530         } lr;
6531         struct nfs_fattr fattr;
6532         int rpc_status;
6533         struct inode *inode;
6534 };
6535
6536 static void nfs4_delegreturn_done(struct rpc_task *task, void *calldata)
6537 {
6538         struct nfs4_delegreturndata *data = calldata;
6539         struct nfs4_exception exception = {
6540                 .inode = data->inode,
6541                 .stateid = &data->stateid,
6542                 .task_is_privileged = data->args.seq_args.sa_privileged,
6543         };
6544
6545         if (!nfs4_sequence_done(task, &data->res.seq_res))
6546                 return;
6547
6548         trace_nfs4_delegreturn_exit(&data->args, &data->res, task->tk_status);
6549
6550         /* Handle Layoutreturn errors */
6551         if (pnfs_roc_done(task, &data->args.lr_args, &data->res.lr_res,
6552                           &data->res.lr_ret) == -EAGAIN)
6553                 goto out_restart;
6554
6555         switch (task->tk_status) {
6556         case 0:
6557                 renew_lease(data->res.server, data->timestamp);
6558                 break;
6559         case -NFS4ERR_ADMIN_REVOKED:
6560         case -NFS4ERR_DELEG_REVOKED:
6561         case -NFS4ERR_EXPIRED:
6562                 nfs4_free_revoked_stateid(data->res.server,
6563                                 data->args.stateid,
6564                                 task->tk_msg.rpc_cred);
6565                 fallthrough;
6566         case -NFS4ERR_BAD_STATEID:
6567         case -NFS4ERR_STALE_STATEID:
6568         case -ETIMEDOUT:
6569                 task->tk_status = 0;
6570                 break;
6571         case -NFS4ERR_OLD_STATEID:
6572                 if (!nfs4_refresh_delegation_stateid(&data->stateid, data->inode))
6573                         nfs4_stateid_seqid_inc(&data->stateid);
6574                 if (data->args.bitmask) {
6575                         data->args.bitmask = NULL;
6576                         data->res.fattr = NULL;
6577                 }
6578                 goto out_restart;
6579         case -NFS4ERR_ACCESS:
6580                 if (data->args.bitmask) {
6581                         data->args.bitmask = NULL;
6582                         data->res.fattr = NULL;
6583                         goto out_restart;
6584                 }
6585                 fallthrough;
6586         default:
6587                 task->tk_status = nfs4_async_handle_exception(task,
6588                                 data->res.server, task->tk_status,
6589                                 &exception);
6590                 if (exception.retry)
6591                         goto out_restart;
6592         }
6593         nfs_delegation_mark_returned(data->inode, data->args.stateid);
6594         data->rpc_status = task->tk_status;
6595         return;
6596 out_restart:
6597         task->tk_status = 0;
6598         rpc_restart_call_prepare(task);
6599 }
6600
6601 static void nfs4_delegreturn_release(void *calldata)
6602 {
6603         struct nfs4_delegreturndata *data = calldata;
6604         struct inode *inode = data->inode;
6605
6606         if (data->lr.roc)
6607                 pnfs_roc_release(&data->lr.arg, &data->lr.res,
6608                                  data->res.lr_ret);
6609         if (inode) {
6610                 nfs4_fattr_set_prechange(&data->fattr,
6611                                          inode_peek_iversion_raw(inode));
6612                 nfs_refresh_inode(inode, &data->fattr);
6613                 nfs_iput_and_deactive(inode);
6614         }
6615         kfree(calldata);
6616 }
6617
6618 static void nfs4_delegreturn_prepare(struct rpc_task *task, void *data)
6619 {
6620         struct nfs4_delegreturndata *d_data;
6621         struct pnfs_layout_hdr *lo;
6622
6623         d_data = data;
6624
6625         if (!d_data->lr.roc && nfs4_wait_on_layoutreturn(d_data->inode, task)) {
6626                 nfs4_sequence_done(task, &d_data->res.seq_res);
6627                 return;
6628         }
6629
6630         lo = d_data->args.lr_args ? d_data->args.lr_args->layout : NULL;
6631         if (lo && !pnfs_layout_is_valid(lo)) {
6632                 d_data->args.lr_args = NULL;
6633                 d_data->res.lr_res = NULL;
6634         }
6635
6636         nfs4_setup_sequence(d_data->res.server->nfs_client,
6637                         &d_data->args.seq_args,
6638                         &d_data->res.seq_res,
6639                         task);
6640 }
6641
6642 static const struct rpc_call_ops nfs4_delegreturn_ops = {
6643         .rpc_call_prepare = nfs4_delegreturn_prepare,
6644         .rpc_call_done = nfs4_delegreturn_done,
6645         .rpc_release = nfs4_delegreturn_release,
6646 };
6647
6648 static int _nfs4_proc_delegreturn(struct inode *inode, const struct cred *cred, const nfs4_stateid *stateid, int issync)
6649 {
6650         struct nfs4_delegreturndata *data;
6651         struct nfs_server *server = NFS_SERVER(inode);
6652         struct rpc_task *task;
6653         struct rpc_message msg = {
6654                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DELEGRETURN],
6655                 .rpc_cred = cred,
6656         };
6657         struct rpc_task_setup task_setup_data = {
6658                 .rpc_client = server->client,
6659                 .rpc_message = &msg,
6660                 .callback_ops = &nfs4_delegreturn_ops,
6661                 .flags = RPC_TASK_ASYNC | RPC_TASK_TIMEOUT,
6662         };
6663         int status = 0;
6664
6665         if (nfs_server_capable(inode, NFS_CAP_MOVEABLE))
6666                 task_setup_data.flags |= RPC_TASK_MOVEABLE;
6667
6668         data = kzalloc(sizeof(*data), GFP_KERNEL);
6669         if (data == NULL)
6670                 return -ENOMEM;
6671
6672         nfs4_state_protect(server->nfs_client,
6673                         NFS_SP4_MACH_CRED_CLEANUP,
6674                         &task_setup_data.rpc_client, &msg);
6675
6676         data->args.fhandle = &data->fh;
6677         data->args.stateid = &data->stateid;
6678         nfs4_bitmask_set(data->args.bitmask_store,
6679                          server->cache_consistency_bitmask, inode, 0);
6680         data->args.bitmask = data->args.bitmask_store;
6681         nfs_copy_fh(&data->fh, NFS_FH(inode));
6682         nfs4_stateid_copy(&data->stateid, stateid);
6683         data->res.fattr = &data->fattr;
6684         data->res.server = server;
6685         data->res.lr_ret = -NFS4ERR_NOMATCHING_LAYOUT;
6686         data->lr.arg.ld_private = &data->lr.ld_private;
6687         nfs_fattr_init(data->res.fattr);
6688         data->timestamp = jiffies;
6689         data->rpc_status = 0;
6690         data->inode = nfs_igrab_and_active(inode);
6691         if (data->inode || issync) {
6692                 data->lr.roc = pnfs_roc(inode, &data->lr.arg, &data->lr.res,
6693                                         cred);
6694                 if (data->lr.roc) {
6695                         data->args.lr_args = &data->lr.arg;
6696                         data->res.lr_res = &data->lr.res;
6697                 }
6698         }
6699
6700         if (!data->inode)
6701                 nfs4_init_sequence(&data->args.seq_args, &data->res.seq_res, 1,
6702                                    1);
6703         else
6704                 nfs4_init_sequence(&data->args.seq_args, &data->res.seq_res, 1,
6705                                    0);
6706         task_setup_data.callback_data = data;
6707         msg.rpc_argp = &data->args;
6708         msg.rpc_resp = &data->res;
6709         task = rpc_run_task(&task_setup_data);
6710         if (IS_ERR(task))
6711                 return PTR_ERR(task);
6712         if (!issync)
6713                 goto out;
6714         status = rpc_wait_for_completion_task(task);
6715         if (status != 0)
6716                 goto out;
6717         status = data->rpc_status;
6718 out:
6719         rpc_put_task(task);
6720         return status;
6721 }
6722
6723 int nfs4_proc_delegreturn(struct inode *inode, const struct cred *cred, const nfs4_stateid *stateid, int issync)
6724 {
6725         struct nfs_server *server = NFS_SERVER(inode);
6726         struct nfs4_exception exception = { };
6727         int err;
6728         do {
6729                 err = _nfs4_proc_delegreturn(inode, cred, stateid, issync);
6730                 trace_nfs4_delegreturn(inode, stateid, err);
6731                 switch (err) {
6732                         case -NFS4ERR_STALE_STATEID:
6733                         case -NFS4ERR_EXPIRED:
6734                         case 0:
6735                                 return 0;
6736                 }
6737                 err = nfs4_handle_exception(server, err, &exception);
6738         } while (exception.retry);
6739         return err;
6740 }
6741
6742 static int _nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request)
6743 {
6744         struct inode *inode = state->inode;
6745         struct nfs_server *server = NFS_SERVER(inode);
6746         struct nfs_client *clp = server->nfs_client;
6747         struct nfs_lockt_args arg = {
6748                 .fh = NFS_FH(inode),
6749                 .fl = request,
6750         };
6751         struct nfs_lockt_res res = {
6752                 .denied = request,
6753         };
6754         struct rpc_message msg = {
6755                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_LOCKT],
6756                 .rpc_argp       = &arg,
6757                 .rpc_resp       = &res,
6758                 .rpc_cred       = state->owner->so_cred,
6759         };
6760         struct nfs4_lock_state *lsp;
6761         int status;
6762
6763         arg.lock_owner.clientid = clp->cl_clientid;
6764         status = nfs4_set_lock_state(state, request);
6765         if (status != 0)
6766                 goto out;
6767         lsp = request->fl_u.nfs4_fl.owner;
6768         arg.lock_owner.id = lsp->ls_seqid.owner_id;
6769         arg.lock_owner.s_dev = server->s_dev;
6770         status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
6771         switch (status) {
6772                 case 0:
6773                         request->fl_type = F_UNLCK;
6774                         break;
6775                 case -NFS4ERR_DENIED:
6776                         status = 0;
6777         }
6778         request->fl_ops->fl_release_private(request);
6779         request->fl_ops = NULL;
6780 out:
6781         return status;
6782 }
6783
6784 static int nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request)
6785 {
6786         struct nfs4_exception exception = {
6787                 .interruptible = true,
6788         };
6789         int err;
6790
6791         do {
6792                 err = _nfs4_proc_getlk(state, cmd, request);
6793                 trace_nfs4_get_lock(request, state, cmd, err);
6794                 err = nfs4_handle_exception(NFS_SERVER(state->inode), err,
6795                                 &exception);
6796         } while (exception.retry);
6797         return err;
6798 }
6799
6800 /*
6801  * Update the seqid of a lock stateid after receiving
6802  * NFS4ERR_OLD_STATEID
6803  */
6804 static bool nfs4_refresh_lock_old_stateid(nfs4_stateid *dst,
6805                 struct nfs4_lock_state *lsp)
6806 {
6807         struct nfs4_state *state = lsp->ls_state;
6808         bool ret = false;
6809
6810         spin_lock(&state->state_lock);
6811         if (!nfs4_stateid_match_other(dst, &lsp->ls_stateid))
6812                 goto out;
6813         if (!nfs4_stateid_is_newer(&lsp->ls_stateid, dst))
6814                 nfs4_stateid_seqid_inc(dst);
6815         else
6816                 dst->seqid = lsp->ls_stateid.seqid;
6817         ret = true;
6818 out:
6819         spin_unlock(&state->state_lock);
6820         return ret;
6821 }
6822
6823 static bool nfs4_sync_lock_stateid(nfs4_stateid *dst,
6824                 struct nfs4_lock_state *lsp)
6825 {
6826         struct nfs4_state *state = lsp->ls_state;
6827         bool ret;
6828
6829         spin_lock(&state->state_lock);
6830         ret = !nfs4_stateid_match_other(dst, &lsp->ls_stateid);
6831         nfs4_stateid_copy(dst, &lsp->ls_stateid);
6832         spin_unlock(&state->state_lock);
6833         return ret;
6834 }
6835
6836 struct nfs4_unlockdata {
6837         struct nfs_locku_args arg;
6838         struct nfs_locku_res res;
6839         struct nfs4_lock_state *lsp;
6840         struct nfs_open_context *ctx;
6841         struct nfs_lock_context *l_ctx;
6842         struct file_lock fl;
6843         struct nfs_server *server;
6844         unsigned long timestamp;
6845 };
6846
6847 static struct nfs4_unlockdata *nfs4_alloc_unlockdata(struct file_lock *fl,
6848                 struct nfs_open_context *ctx,
6849                 struct nfs4_lock_state *lsp,
6850                 struct nfs_seqid *seqid)
6851 {
6852         struct nfs4_unlockdata *p;
6853         struct nfs4_state *state = lsp->ls_state;
6854         struct inode *inode = state->inode;
6855
6856         p = kzalloc(sizeof(*p), GFP_KERNEL);
6857         if (p == NULL)
6858                 return NULL;
6859         p->arg.fh = NFS_FH(inode);
6860         p->arg.fl = &p->fl;
6861         p->arg.seqid = seqid;
6862         p->res.seqid = seqid;
6863         p->lsp = lsp;
6864         /* Ensure we don't close file until we're done freeing locks! */
6865         p->ctx = get_nfs_open_context(ctx);
6866         p->l_ctx = nfs_get_lock_context(ctx);
6867         locks_init_lock(&p->fl);
6868         locks_copy_lock(&p->fl, fl);
6869         p->server = NFS_SERVER(inode);
6870         spin_lock(&state->state_lock);
6871         nfs4_stateid_copy(&p->arg.stateid, &lsp->ls_stateid);
6872         spin_unlock(&state->state_lock);
6873         return p;
6874 }
6875
6876 static void nfs4_locku_release_calldata(void *data)
6877 {
6878         struct nfs4_unlockdata *calldata = data;
6879         nfs_free_seqid(calldata->arg.seqid);
6880         nfs4_put_lock_state(calldata->lsp);
6881         nfs_put_lock_context(calldata->l_ctx);
6882         put_nfs_open_context(calldata->ctx);
6883         kfree(calldata);
6884 }
6885
6886 static void nfs4_locku_done(struct rpc_task *task, void *data)
6887 {
6888         struct nfs4_unlockdata *calldata = data;
6889         struct nfs4_exception exception = {
6890                 .inode = calldata->lsp->ls_state->inode,
6891                 .stateid = &calldata->arg.stateid,
6892         };
6893
6894         if (!nfs4_sequence_done(task, &calldata->res.seq_res))
6895                 return;
6896         switch (task->tk_status) {
6897                 case 0:
6898                         renew_lease(calldata->server, calldata->timestamp);
6899                         locks_lock_inode_wait(calldata->lsp->ls_state->inode, &calldata->fl);
6900                         if (nfs4_update_lock_stateid(calldata->lsp,
6901                                         &calldata->res.stateid))
6902                                 break;
6903                         fallthrough;
6904                 case -NFS4ERR_ADMIN_REVOKED:
6905                 case -NFS4ERR_EXPIRED:
6906                         nfs4_free_revoked_stateid(calldata->server,
6907                                         &calldata->arg.stateid,
6908                                         task->tk_msg.rpc_cred);
6909                         fallthrough;
6910                 case -NFS4ERR_BAD_STATEID:
6911                 case -NFS4ERR_STALE_STATEID:
6912                         if (nfs4_sync_lock_stateid(&calldata->arg.stateid,
6913                                                 calldata->lsp))
6914                                 rpc_restart_call_prepare(task);
6915                         break;
6916                 case -NFS4ERR_OLD_STATEID:
6917                         if (nfs4_refresh_lock_old_stateid(&calldata->arg.stateid,
6918                                                 calldata->lsp))
6919                                 rpc_restart_call_prepare(task);
6920                         break;
6921                 default:
6922                         task->tk_status = nfs4_async_handle_exception(task,
6923                                         calldata->server, task->tk_status,
6924                                         &exception);
6925                         if (exception.retry)
6926                                 rpc_restart_call_prepare(task);
6927         }
6928         nfs_release_seqid(calldata->arg.seqid);
6929 }
6930
6931 static void nfs4_locku_prepare(struct rpc_task *task, void *data)
6932 {
6933         struct nfs4_unlockdata *calldata = data;
6934
6935         if (test_bit(NFS_CONTEXT_UNLOCK, &calldata->l_ctx->open_context->flags) &&
6936                 nfs_async_iocounter_wait(task, calldata->l_ctx))
6937                 return;
6938
6939         if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0)
6940                 goto out_wait;
6941         if (test_bit(NFS_LOCK_INITIALIZED, &calldata->lsp->ls_flags) == 0) {
6942                 /* Note: exit _without_ running nfs4_locku_done */
6943                 goto out_no_action;
6944         }
6945         calldata->timestamp = jiffies;
6946         if (nfs4_setup_sequence(calldata->server->nfs_client,
6947                                 &calldata->arg.seq_args,
6948                                 &calldata->res.seq_res,
6949                                 task) != 0)
6950                 nfs_release_seqid(calldata->arg.seqid);
6951         return;
6952 out_no_action:
6953         task->tk_action = NULL;
6954 out_wait:
6955         nfs4_sequence_done(task, &calldata->res.seq_res);
6956 }
6957
6958 static const struct rpc_call_ops nfs4_locku_ops = {
6959         .rpc_call_prepare = nfs4_locku_prepare,
6960         .rpc_call_done = nfs4_locku_done,
6961         .rpc_release = nfs4_locku_release_calldata,
6962 };
6963
6964 static struct rpc_task *nfs4_do_unlck(struct file_lock *fl,
6965                 struct nfs_open_context *ctx,
6966                 struct nfs4_lock_state *lsp,
6967                 struct nfs_seqid *seqid)
6968 {
6969         struct nfs4_unlockdata *data;
6970         struct rpc_message msg = {
6971                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCKU],
6972                 .rpc_cred = ctx->cred,
6973         };
6974         struct rpc_task_setup task_setup_data = {
6975                 .rpc_client = NFS_CLIENT(lsp->ls_state->inode),
6976                 .rpc_message = &msg,
6977                 .callback_ops = &nfs4_locku_ops,
6978                 .workqueue = nfsiod_workqueue,
6979                 .flags = RPC_TASK_ASYNC,
6980         };
6981
6982         if (nfs_server_capable(lsp->ls_state->inode, NFS_CAP_MOVEABLE))
6983                 task_setup_data.flags |= RPC_TASK_MOVEABLE;
6984
6985         nfs4_state_protect(NFS_SERVER(lsp->ls_state->inode)->nfs_client,
6986                 NFS_SP4_MACH_CRED_CLEANUP, &task_setup_data.rpc_client, &msg);
6987
6988         /* Ensure this is an unlock - when canceling a lock, the
6989          * canceled lock is passed in, and it won't be an unlock.
6990          */
6991         fl->fl_type = F_UNLCK;
6992         if (fl->fl_flags & FL_CLOSE)
6993                 set_bit(NFS_CONTEXT_UNLOCK, &ctx->flags);
6994
6995         data = nfs4_alloc_unlockdata(fl, ctx, lsp, seqid);
6996         if (data == NULL) {
6997                 nfs_free_seqid(seqid);
6998                 return ERR_PTR(-ENOMEM);
6999         }
7000
7001         nfs4_init_sequence(&data->arg.seq_args, &data->res.seq_res, 1, 0);
7002         msg.rpc_argp = &data->arg;
7003         msg.rpc_resp = &data->res;
7004         task_setup_data.callback_data = data;
7005         return rpc_run_task(&task_setup_data);
7006 }
7007
7008 static int nfs4_proc_unlck(struct nfs4_state *state, int cmd, struct file_lock *request)
7009 {
7010         struct inode *inode = state->inode;
7011         struct nfs4_state_owner *sp = state->owner;
7012         struct nfs_inode *nfsi = NFS_I(inode);
7013         struct nfs_seqid *seqid;
7014         struct nfs4_lock_state *lsp;
7015         struct rpc_task *task;
7016         struct nfs_seqid *(*alloc_seqid)(struct nfs_seqid_counter *, gfp_t);
7017         int status = 0;
7018         unsigned char fl_flags = request->fl_flags;
7019
7020         status = nfs4_set_lock_state(state, request);
7021         /* Unlock _before_ we do the RPC call */
7022         request->fl_flags |= FL_EXISTS;
7023         /* Exclude nfs_delegation_claim_locks() */
7024         mutex_lock(&sp->so_delegreturn_mutex);
7025         /* Exclude nfs4_reclaim_open_stateid() - note nesting! */
7026         down_read(&nfsi->rwsem);
7027         if (locks_lock_inode_wait(inode, request) == -ENOENT) {
7028                 up_read(&nfsi->rwsem);
7029                 mutex_unlock(&sp->so_delegreturn_mutex);
7030                 goto out;
7031         }
7032         lsp = request->fl_u.nfs4_fl.owner;
7033         set_bit(NFS_LOCK_UNLOCKING, &lsp->ls_flags);
7034         up_read(&nfsi->rwsem);
7035         mutex_unlock(&sp->so_delegreturn_mutex);
7036         if (status != 0)
7037                 goto out;
7038         /* Is this a delegated lock? */
7039         if (test_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags) == 0)
7040                 goto out;
7041         alloc_seqid = NFS_SERVER(inode)->nfs_client->cl_mvops->alloc_seqid;
7042         seqid = alloc_seqid(&lsp->ls_seqid, GFP_KERNEL);
7043         status = -ENOMEM;
7044         if (IS_ERR(seqid))
7045                 goto out;
7046         task = nfs4_do_unlck(request, nfs_file_open_context(request->fl_file), lsp, seqid);
7047         status = PTR_ERR(task);
7048         if (IS_ERR(task))
7049                 goto out;
7050         status = rpc_wait_for_completion_task(task);
7051         rpc_put_task(task);
7052 out:
7053         request->fl_flags = fl_flags;
7054         trace_nfs4_unlock(request, state, F_SETLK, status);
7055         return status;
7056 }
7057
7058 struct nfs4_lockdata {
7059         struct nfs_lock_args arg;
7060         struct nfs_lock_res res;
7061         struct nfs4_lock_state *lsp;
7062         struct nfs_open_context *ctx;
7063         struct file_lock fl;
7064         unsigned long timestamp;
7065         int rpc_status;
7066         int cancelled;
7067         struct nfs_server *server;
7068 };
7069
7070 static struct nfs4_lockdata *nfs4_alloc_lockdata(struct file_lock *fl,
7071                 struct nfs_open_context *ctx, struct nfs4_lock_state *lsp,
7072                 gfp_t gfp_mask)
7073 {
7074         struct nfs4_lockdata *p;
7075         struct inode *inode = lsp->ls_state->inode;
7076         struct nfs_server *server = NFS_SERVER(inode);
7077         struct nfs_seqid *(*alloc_seqid)(struct nfs_seqid_counter *, gfp_t);
7078
7079         p = kzalloc(sizeof(*p), gfp_mask);
7080         if (p == NULL)
7081                 return NULL;
7082
7083         p->arg.fh = NFS_FH(inode);
7084         p->arg.fl = &p->fl;
7085         p->arg.open_seqid = nfs_alloc_seqid(&lsp->ls_state->owner->so_seqid, gfp_mask);
7086         if (IS_ERR(p->arg.open_seqid))
7087                 goto out_free;
7088         alloc_seqid = server->nfs_client->cl_mvops->alloc_seqid;
7089         p->arg.lock_seqid = alloc_seqid(&lsp->ls_seqid, gfp_mask);
7090         if (IS_ERR(p->arg.lock_seqid))
7091                 goto out_free_seqid;
7092         p->arg.lock_owner.clientid = server->nfs_client->cl_clientid;
7093         p->arg.lock_owner.id = lsp->ls_seqid.owner_id;
7094         p->arg.lock_owner.s_dev = server->s_dev;
7095         p->res.lock_seqid = p->arg.lock_seqid;
7096         p->lsp = lsp;
7097         p->server = server;
7098         p->ctx = get_nfs_open_context(ctx);
7099         locks_init_lock(&p->fl);
7100         locks_copy_lock(&p->fl, fl);
7101         return p;
7102 out_free_seqid:
7103         nfs_free_seqid(p->arg.open_seqid);
7104 out_free:
7105         kfree(p);
7106         return NULL;
7107 }
7108
7109 static void nfs4_lock_prepare(struct rpc_task *task, void *calldata)
7110 {
7111         struct nfs4_lockdata *data = calldata;
7112         struct nfs4_state *state = data->lsp->ls_state;
7113
7114         if (nfs_wait_on_sequence(data->arg.lock_seqid, task) != 0)
7115                 goto out_wait;
7116         /* Do we need to do an open_to_lock_owner? */
7117         if (!test_bit(NFS_LOCK_INITIALIZED, &data->lsp->ls_flags)) {
7118                 if (nfs_wait_on_sequence(data->arg.open_seqid, task) != 0) {
7119                         goto out_release_lock_seqid;
7120                 }
7121                 nfs4_stateid_copy(&data->arg.open_stateid,
7122                                 &state->open_stateid);
7123                 data->arg.new_lock_owner = 1;
7124                 data->res.open_seqid = data->arg.open_seqid;
7125         } else {
7126                 data->arg.new_lock_owner = 0;
7127                 nfs4_stateid_copy(&data->arg.lock_stateid,
7128                                 &data->lsp->ls_stateid);
7129         }
7130         if (!nfs4_valid_open_stateid(state)) {
7131                 data->rpc_status = -EBADF;
7132                 task->tk_action = NULL;
7133                 goto out_release_open_seqid;
7134         }
7135         data->timestamp = jiffies;
7136         if (nfs4_setup_sequence(data->server->nfs_client,
7137                                 &data->arg.seq_args,
7138                                 &data->res.seq_res,
7139                                 task) == 0)
7140                 return;
7141 out_release_open_seqid:
7142         nfs_release_seqid(data->arg.open_seqid);
7143 out_release_lock_seqid:
7144         nfs_release_seqid(data->arg.lock_seqid);
7145 out_wait:
7146         nfs4_sequence_done(task, &data->res.seq_res);
7147         dprintk("%s: ret = %d\n", __func__, data->rpc_status);
7148 }
7149
7150 static void nfs4_lock_done(struct rpc_task *task, void *calldata)
7151 {
7152         struct nfs4_lockdata *data = calldata;
7153         struct nfs4_lock_state *lsp = data->lsp;
7154         struct nfs_server *server = NFS_SERVER(d_inode(data->ctx->dentry));
7155
7156         if (!nfs4_sequence_done(task, &data->res.seq_res))
7157                 return;
7158
7159         data->rpc_status = task->tk_status;
7160         switch (task->tk_status) {
7161         case 0:
7162                 renew_lease(server, data->timestamp);
7163                 if (data->arg.new_lock && !data->cancelled) {
7164                         data->fl.fl_flags &= ~(FL_SLEEP | FL_ACCESS);
7165                         if (locks_lock_inode_wait(lsp->ls_state->inode, &data->fl) < 0)
7166                                 goto out_restart;
7167                 }
7168                 if (data->arg.new_lock_owner != 0) {
7169                         nfs_confirm_seqid(&lsp->ls_seqid, 0);
7170                         nfs4_stateid_copy(&lsp->ls_stateid, &data->res.stateid);
7171                         set_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags);
7172                 } else if (!nfs4_update_lock_stateid(lsp, &data->res.stateid))
7173                         goto out_restart;
7174                 break;
7175         case -NFS4ERR_BAD_STATEID:
7176         case -NFS4ERR_OLD_STATEID:
7177         case -NFS4ERR_STALE_STATEID:
7178         case -NFS4ERR_EXPIRED:
7179                 if (data->arg.new_lock_owner != 0) {
7180                         if (!nfs4_stateid_match(&data->arg.open_stateid,
7181                                                 &lsp->ls_state->open_stateid))
7182                                 goto out_restart;
7183                         else if (nfs4_async_handle_error(task, server, lsp->ls_state, NULL) == -EAGAIN)
7184                                 goto out_restart;
7185                 } else if (!nfs4_stateid_match(&data->arg.lock_stateid,
7186                                                 &lsp->ls_stateid))
7187                                 goto out_restart;
7188         }
7189 out_done:
7190         dprintk("%s: ret = %d!\n", __func__, data->rpc_status);
7191         return;
7192 out_restart:
7193         if (!data->cancelled)
7194                 rpc_restart_call_prepare(task);
7195         goto out_done;
7196 }
7197
7198 static void nfs4_lock_release(void *calldata)
7199 {
7200         struct nfs4_lockdata *data = calldata;
7201
7202         nfs_free_seqid(data->arg.open_seqid);
7203         if (data->cancelled && data->rpc_status == 0) {
7204                 struct rpc_task *task;
7205                 task = nfs4_do_unlck(&data->fl, data->ctx, data->lsp,
7206                                 data->arg.lock_seqid);
7207                 if (!IS_ERR(task))
7208                         rpc_put_task_async(task);
7209                 dprintk("%s: cancelling lock!\n", __func__);
7210         } else
7211                 nfs_free_seqid(data->arg.lock_seqid);
7212         nfs4_put_lock_state(data->lsp);
7213         put_nfs_open_context(data->ctx);
7214         kfree(data);
7215 }
7216
7217 static const struct rpc_call_ops nfs4_lock_ops = {
7218         .rpc_call_prepare = nfs4_lock_prepare,
7219         .rpc_call_done = nfs4_lock_done,
7220         .rpc_release = nfs4_lock_release,
7221 };
7222
7223 static void nfs4_handle_setlk_error(struct nfs_server *server, struct nfs4_lock_state *lsp, int new_lock_owner, int error)
7224 {
7225         switch (error) {
7226         case -NFS4ERR_ADMIN_REVOKED:
7227         case -NFS4ERR_EXPIRED:
7228         case -NFS4ERR_BAD_STATEID:
7229                 lsp->ls_seqid.flags &= ~NFS_SEQID_CONFIRMED;
7230                 if (new_lock_owner != 0 ||
7231                    test_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags) != 0)
7232                         nfs4_schedule_stateid_recovery(server, lsp->ls_state);
7233                 break;
7234         case -NFS4ERR_STALE_STATEID:
7235                 lsp->ls_seqid.flags &= ~NFS_SEQID_CONFIRMED;
7236                 nfs4_schedule_lease_recovery(server->nfs_client);
7237         }
7238 }
7239
7240 static int _nfs4_do_setlk(struct nfs4_state *state, int cmd, struct file_lock *fl, int recovery_type)
7241 {
7242         struct nfs4_lockdata *data;
7243         struct rpc_task *task;
7244         struct rpc_message msg = {
7245                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCK],
7246                 .rpc_cred = state->owner->so_cred,
7247         };
7248         struct rpc_task_setup task_setup_data = {
7249                 .rpc_client = NFS_CLIENT(state->inode),
7250                 .rpc_message = &msg,
7251                 .callback_ops = &nfs4_lock_ops,
7252                 .workqueue = nfsiod_workqueue,
7253                 .flags = RPC_TASK_ASYNC | RPC_TASK_CRED_NOREF,
7254         };
7255         int ret;
7256
7257         if (nfs_server_capable(state->inode, NFS_CAP_MOVEABLE))
7258                 task_setup_data.flags |= RPC_TASK_MOVEABLE;
7259
7260         data = nfs4_alloc_lockdata(fl, nfs_file_open_context(fl->fl_file),
7261                                    fl->fl_u.nfs4_fl.owner, GFP_KERNEL);
7262         if (data == NULL)
7263                 return -ENOMEM;
7264         if (IS_SETLKW(cmd))
7265                 data->arg.block = 1;
7266         nfs4_init_sequence(&data->arg.seq_args, &data->res.seq_res, 1,
7267                                 recovery_type > NFS_LOCK_NEW);
7268         msg.rpc_argp = &data->arg;
7269         msg.rpc_resp = &data->res;
7270         task_setup_data.callback_data = data;
7271         if (recovery_type > NFS_LOCK_NEW) {
7272                 if (recovery_type == NFS_LOCK_RECLAIM)
7273                         data->arg.reclaim = NFS_LOCK_RECLAIM;
7274         } else
7275                 data->arg.new_lock = 1;
7276         task = rpc_run_task(&task_setup_data);
7277         if (IS_ERR(task))
7278                 return PTR_ERR(task);
7279         ret = rpc_wait_for_completion_task(task);
7280         if (ret == 0) {
7281                 ret = data->rpc_status;
7282                 if (ret)
7283                         nfs4_handle_setlk_error(data->server, data->lsp,
7284                                         data->arg.new_lock_owner, ret);
7285         } else
7286                 data->cancelled = true;
7287         trace_nfs4_set_lock(fl, state, &data->res.stateid, cmd, ret);
7288         rpc_put_task(task);
7289         dprintk("%s: ret = %d\n", __func__, ret);
7290         return ret;
7291 }
7292
7293 static int nfs4_lock_reclaim(struct nfs4_state *state, struct file_lock *request)
7294 {
7295         struct nfs_server *server = NFS_SERVER(state->inode);
7296         struct nfs4_exception exception = {
7297                 .inode = state->inode,
7298         };
7299         int err;
7300
7301         do {
7302                 /* Cache the lock if possible... */
7303                 if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0)
7304                         return 0;
7305                 err = _nfs4_do_setlk(state, F_SETLK, request, NFS_LOCK_RECLAIM);
7306                 if (err != -NFS4ERR_DELAY)
7307                         break;
7308                 nfs4_handle_exception(server, err, &exception);
7309         } while (exception.retry);
7310         return err;
7311 }
7312
7313 static int nfs4_lock_expired(struct nfs4_state *state, struct file_lock *request)
7314 {
7315         struct nfs_server *server = NFS_SERVER(state->inode);
7316         struct nfs4_exception exception = {
7317                 .inode = state->inode,
7318         };
7319         int err;
7320
7321         err = nfs4_set_lock_state(state, request);
7322         if (err != 0)
7323                 return err;
7324         if (!recover_lost_locks) {
7325                 set_bit(NFS_LOCK_LOST, &request->fl_u.nfs4_fl.owner->ls_flags);
7326                 return 0;
7327         }
7328         do {
7329                 if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0)
7330                         return 0;
7331                 err = _nfs4_do_setlk(state, F_SETLK, request, NFS_LOCK_EXPIRED);
7332                 switch (err) {
7333                 default:
7334                         goto out;
7335                 case -NFS4ERR_GRACE:
7336                 case -NFS4ERR_DELAY:
7337                         nfs4_handle_exception(server, err, &exception);
7338                         err = 0;
7339                 }
7340         } while (exception.retry);
7341 out:
7342         return err;
7343 }
7344
7345 #if defined(CONFIG_NFS_V4_1)
7346 static int nfs41_lock_expired(struct nfs4_state *state, struct file_lock *request)
7347 {
7348         struct nfs4_lock_state *lsp;
7349         int status;
7350
7351         status = nfs4_set_lock_state(state, request);
7352         if (status != 0)
7353                 return status;
7354         lsp = request->fl_u.nfs4_fl.owner;
7355         if (test_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags) ||
7356             test_bit(NFS_LOCK_LOST, &lsp->ls_flags))
7357                 return 0;
7358         return nfs4_lock_expired(state, request);
7359 }
7360 #endif
7361
7362 static int _nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
7363 {
7364         struct nfs_inode *nfsi = NFS_I(state->inode);
7365         struct nfs4_state_owner *sp = state->owner;
7366         unsigned char fl_flags = request->fl_flags;
7367         int status;
7368
7369         request->fl_flags |= FL_ACCESS;
7370         status = locks_lock_inode_wait(state->inode, request);
7371         if (status < 0)
7372                 goto out;
7373         mutex_lock(&sp->so_delegreturn_mutex);
7374         down_read(&nfsi->rwsem);
7375         if (test_bit(NFS_DELEGATED_STATE, &state->flags)) {
7376                 /* Yes: cache locks! */
7377                 /* ...but avoid races with delegation recall... */
7378                 request->fl_flags = fl_flags & ~FL_SLEEP;
7379                 status = locks_lock_inode_wait(state->inode, request);
7380                 up_read(&nfsi->rwsem);
7381                 mutex_unlock(&sp->so_delegreturn_mutex);
7382                 goto out;
7383         }
7384         up_read(&nfsi->rwsem);
7385         mutex_unlock(&sp->so_delegreturn_mutex);
7386         status = _nfs4_do_setlk(state, cmd, request, NFS_LOCK_NEW);
7387 out:
7388         request->fl_flags = fl_flags;
7389         return status;
7390 }
7391
7392 static int nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
7393 {
7394         struct nfs4_exception exception = {
7395                 .state = state,
7396                 .inode = state->inode,
7397                 .interruptible = true,
7398         };
7399         int err;
7400
7401         do {
7402                 err = _nfs4_proc_setlk(state, cmd, request);
7403                 if (err == -NFS4ERR_DENIED)
7404                         err = -EAGAIN;
7405                 err = nfs4_handle_exception(NFS_SERVER(state->inode),
7406                                 err, &exception);
7407         } while (exception.retry);
7408         return err;
7409 }
7410
7411 #define NFS4_LOCK_MINTIMEOUT (1 * HZ)
7412 #define NFS4_LOCK_MAXTIMEOUT (30 * HZ)
7413
7414 static int
7415 nfs4_retry_setlk_simple(struct nfs4_state *state, int cmd,
7416                         struct file_lock *request)
7417 {
7418         int             status = -ERESTARTSYS;
7419         unsigned long   timeout = NFS4_LOCK_MINTIMEOUT;
7420
7421         while(!signalled()) {
7422                 status = nfs4_proc_setlk(state, cmd, request);
7423                 if ((status != -EAGAIN) || IS_SETLK(cmd))
7424                         break;
7425                 __set_current_state(TASK_INTERRUPTIBLE|TASK_FREEZABLE);
7426                 schedule_timeout(timeout);
7427                 timeout *= 2;
7428                 timeout = min_t(unsigned long, NFS4_LOCK_MAXTIMEOUT, timeout);
7429                 status = -ERESTARTSYS;
7430         }
7431         return status;
7432 }
7433
7434 #ifdef CONFIG_NFS_V4_1
7435 struct nfs4_lock_waiter {
7436         struct inode            *inode;
7437         struct nfs_lowner       owner;
7438         wait_queue_entry_t      wait;
7439 };
7440
7441 static int
7442 nfs4_wake_lock_waiter(wait_queue_entry_t *wait, unsigned int mode, int flags, void *key)
7443 {
7444         struct nfs4_lock_waiter *waiter =
7445                 container_of(wait, struct nfs4_lock_waiter, wait);
7446
7447         /* NULL key means to wake up everyone */
7448         if (key) {
7449                 struct cb_notify_lock_args      *cbnl = key;
7450                 struct nfs_lowner               *lowner = &cbnl->cbnl_owner,
7451                                                 *wowner = &waiter->owner;
7452
7453                 /* Only wake if the callback was for the same owner. */
7454                 if (lowner->id != wowner->id || lowner->s_dev != wowner->s_dev)
7455                         return 0;
7456
7457                 /* Make sure it's for the right inode */
7458                 if (nfs_compare_fh(NFS_FH(waiter->inode), &cbnl->cbnl_fh))
7459                         return 0;
7460         }
7461
7462         return woken_wake_function(wait, mode, flags, key);
7463 }
7464
7465 static int
7466 nfs4_retry_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
7467 {
7468         struct nfs4_lock_state *lsp = request->fl_u.nfs4_fl.owner;
7469         struct nfs_server *server = NFS_SERVER(state->inode);
7470         struct nfs_client *clp = server->nfs_client;
7471         wait_queue_head_t *q = &clp->cl_lock_waitq;
7472         struct nfs4_lock_waiter waiter = {
7473                 .inode = state->inode,
7474                 .owner = { .clientid = clp->cl_clientid,
7475                            .id = lsp->ls_seqid.owner_id,
7476                            .s_dev = server->s_dev },
7477         };
7478         int status;
7479
7480         /* Don't bother with waitqueue if we don't expect a callback */
7481         if (!test_bit(NFS_STATE_MAY_NOTIFY_LOCK, &state->flags))
7482                 return nfs4_retry_setlk_simple(state, cmd, request);
7483
7484         init_wait(&waiter.wait);
7485         waiter.wait.func = nfs4_wake_lock_waiter;
7486         add_wait_queue(q, &waiter.wait);
7487
7488         do {
7489                 status = nfs4_proc_setlk(state, cmd, request);
7490                 if (status != -EAGAIN || IS_SETLK(cmd))
7491                         break;
7492
7493                 status = -ERESTARTSYS;
7494                 wait_woken(&waiter.wait, TASK_INTERRUPTIBLE|TASK_FREEZABLE,
7495                            NFS4_LOCK_MAXTIMEOUT);
7496         } while (!signalled());
7497
7498         remove_wait_queue(q, &waiter.wait);
7499
7500         return status;
7501 }
7502 #else /* !CONFIG_NFS_V4_1 */
7503 static inline int
7504 nfs4_retry_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
7505 {
7506         return nfs4_retry_setlk_simple(state, cmd, request);
7507 }
7508 #endif
7509
7510 static int
7511 nfs4_proc_lock(struct file *filp, int cmd, struct file_lock *request)
7512 {
7513         struct nfs_open_context *ctx;
7514         struct nfs4_state *state;
7515         int status;
7516
7517         /* verify open state */
7518         ctx = nfs_file_open_context(filp);
7519         state = ctx->state;
7520
7521         if (IS_GETLK(cmd)) {
7522                 if (state != NULL)
7523                         return nfs4_proc_getlk(state, F_GETLK, request);
7524                 return 0;
7525         }
7526
7527         if (!(IS_SETLK(cmd) || IS_SETLKW(cmd)))
7528                 return -EINVAL;
7529
7530         if (request->fl_type == F_UNLCK) {
7531                 if (state != NULL)
7532                         return nfs4_proc_unlck(state, cmd, request);
7533                 return 0;
7534         }
7535
7536         if (state == NULL)
7537                 return -ENOLCK;
7538
7539         if ((request->fl_flags & FL_POSIX) &&
7540             !test_bit(NFS_STATE_POSIX_LOCKS, &state->flags))
7541                 return -ENOLCK;
7542
7543         /*
7544          * Don't rely on the VFS having checked the file open mode,
7545          * since it won't do this for flock() locks.
7546          */
7547         switch (request->fl_type) {
7548         case F_RDLCK:
7549                 if (!(filp->f_mode & FMODE_READ))
7550                         return -EBADF;
7551                 break;
7552         case F_WRLCK:
7553                 if (!(filp->f_mode & FMODE_WRITE))
7554                         return -EBADF;
7555         }
7556
7557         status = nfs4_set_lock_state(state, request);
7558         if (status != 0)
7559                 return status;
7560
7561         return nfs4_retry_setlk(state, cmd, request);
7562 }
7563
7564 static int nfs4_delete_lease(struct file *file, void **priv)
7565 {
7566         return generic_setlease(file, F_UNLCK, NULL, priv);
7567 }
7568
7569 static int nfs4_add_lease(struct file *file, long arg, struct file_lock **lease,
7570                           void **priv)
7571 {
7572         struct inode *inode = file_inode(file);
7573         fmode_t type = arg == F_RDLCK ? FMODE_READ : FMODE_WRITE;
7574         int ret;
7575
7576         /* No delegation, no lease */
7577         if (!nfs4_have_delegation(inode, type))
7578                 return -EAGAIN;
7579         ret = generic_setlease(file, arg, lease, priv);
7580         if (ret || nfs4_have_delegation(inode, type))
7581                 return ret;
7582         /* We raced with a delegation return */
7583         nfs4_delete_lease(file, priv);
7584         return -EAGAIN;
7585 }
7586
7587 int nfs4_proc_setlease(struct file *file, long arg, struct file_lock **lease,
7588                        void **priv)
7589 {
7590         switch (arg) {
7591         case F_RDLCK:
7592         case F_WRLCK:
7593                 return nfs4_add_lease(file, arg, lease, priv);
7594         case F_UNLCK:
7595                 return nfs4_delete_lease(file, priv);
7596         default:
7597                 return -EINVAL;
7598         }
7599 }
7600
7601 int nfs4_lock_delegation_recall(struct file_lock *fl, struct nfs4_state *state, const nfs4_stateid *stateid)
7602 {
7603         struct nfs_server *server = NFS_SERVER(state->inode);
7604         int err;
7605
7606         err = nfs4_set_lock_state(state, fl);
7607         if (err != 0)
7608                 return err;
7609         do {
7610                 err = _nfs4_do_setlk(state, F_SETLK, fl, NFS_LOCK_NEW);
7611                 if (err != -NFS4ERR_DELAY)
7612                         break;
7613                 ssleep(1);
7614         } while (err == -NFS4ERR_DELAY);
7615         return nfs4_handle_delegation_recall_error(server, state, stateid, fl, err);
7616 }
7617
7618 struct nfs_release_lockowner_data {
7619         struct nfs4_lock_state *lsp;
7620         struct nfs_server *server;
7621         struct nfs_release_lockowner_args args;
7622         struct nfs_release_lockowner_res res;
7623         unsigned long timestamp;
7624 };
7625
7626 static void nfs4_release_lockowner_prepare(struct rpc_task *task, void *calldata)
7627 {
7628         struct nfs_release_lockowner_data *data = calldata;
7629         struct nfs_server *server = data->server;
7630         nfs4_setup_sequence(server->nfs_client, &data->args.seq_args,
7631                            &data->res.seq_res, task);
7632         data->args.lock_owner.clientid = server->nfs_client->cl_clientid;
7633         data->timestamp = jiffies;
7634 }
7635
7636 static void nfs4_release_lockowner_done(struct rpc_task *task, void *calldata)
7637 {
7638         struct nfs_release_lockowner_data *data = calldata;
7639         struct nfs_server *server = data->server;
7640
7641         nfs40_sequence_done(task, &data->res.seq_res);
7642
7643         switch (task->tk_status) {
7644         case 0:
7645                 renew_lease(server, data->timestamp);
7646                 break;
7647         case -NFS4ERR_STALE_CLIENTID:
7648         case -NFS4ERR_EXPIRED:
7649                 nfs4_schedule_lease_recovery(server->nfs_client);
7650                 break;
7651         case -NFS4ERR_LEASE_MOVED:
7652         case -NFS4ERR_DELAY:
7653                 if (nfs4_async_handle_error(task, server,
7654                                             NULL, NULL) == -EAGAIN)
7655                         rpc_restart_call_prepare(task);
7656         }
7657 }
7658
7659 static void nfs4_release_lockowner_release(void *calldata)
7660 {
7661         struct nfs_release_lockowner_data *data = calldata;
7662         nfs4_free_lock_state(data->server, data->lsp);
7663         kfree(calldata);
7664 }
7665
7666 static const struct rpc_call_ops nfs4_release_lockowner_ops = {
7667         .rpc_call_prepare = nfs4_release_lockowner_prepare,
7668         .rpc_call_done = nfs4_release_lockowner_done,
7669         .rpc_release = nfs4_release_lockowner_release,
7670 };
7671
7672 static void
7673 nfs4_release_lockowner(struct nfs_server *server, struct nfs4_lock_state *lsp)
7674 {
7675         struct nfs_release_lockowner_data *data;
7676         struct rpc_message msg = {
7677                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RELEASE_LOCKOWNER],
7678         };
7679
7680         if (server->nfs_client->cl_mvops->minor_version != 0)
7681                 return;
7682
7683         data = kmalloc(sizeof(*data), GFP_KERNEL);
7684         if (!data)
7685                 return;
7686         data->lsp = lsp;
7687         data->server = server;
7688         data->args.lock_owner.clientid = server->nfs_client->cl_clientid;
7689         data->args.lock_owner.id = lsp->ls_seqid.owner_id;
7690         data->args.lock_owner.s_dev = server->s_dev;
7691
7692         msg.rpc_argp = &data->args;
7693         msg.rpc_resp = &data->res;
7694         nfs4_init_sequence(&data->args.seq_args, &data->res.seq_res, 0, 0);
7695         rpc_call_async(server->client, &msg, 0, &nfs4_release_lockowner_ops, data);
7696 }
7697
7698 #define XATTR_NAME_NFSV4_ACL "system.nfs4_acl"
7699
7700 static int nfs4_xattr_set_nfs4_acl(const struct xattr_handler *handler,
7701                                    struct mnt_idmap *idmap,
7702                                    struct dentry *unused, struct inode *inode,
7703                                    const char *key, const void *buf,
7704                                    size_t buflen, int flags)
7705 {
7706         return nfs4_proc_set_acl(inode, buf, buflen, NFS4ACL_ACL);
7707 }
7708
7709 static int nfs4_xattr_get_nfs4_acl(const struct xattr_handler *handler,
7710                                    struct dentry *unused, struct inode *inode,
7711                                    const char *key, void *buf, size_t buflen)
7712 {
7713         return nfs4_proc_get_acl(inode, buf, buflen, NFS4ACL_ACL);
7714 }
7715
7716 static bool nfs4_xattr_list_nfs4_acl(struct dentry *dentry)
7717 {
7718         return nfs4_server_supports_acls(NFS_SB(dentry->d_sb), NFS4ACL_ACL);
7719 }
7720
7721 #if defined(CONFIG_NFS_V4_1)
7722 #define XATTR_NAME_NFSV4_DACL "system.nfs4_dacl"
7723
7724 static int nfs4_xattr_set_nfs4_dacl(const struct xattr_handler *handler,
7725                                     struct mnt_idmap *idmap,
7726                                     struct dentry *unused, struct inode *inode,
7727                                     const char *key, const void *buf,
7728                                     size_t buflen, int flags)
7729 {
7730         return nfs4_proc_set_acl(inode, buf, buflen, NFS4ACL_DACL);
7731 }
7732
7733 static int nfs4_xattr_get_nfs4_dacl(const struct xattr_handler *handler,
7734                                     struct dentry *unused, struct inode *inode,
7735                                     const char *key, void *buf, size_t buflen)
7736 {
7737         return nfs4_proc_get_acl(inode, buf, buflen, NFS4ACL_DACL);
7738 }
7739
7740 static bool nfs4_xattr_list_nfs4_dacl(struct dentry *dentry)
7741 {
7742         return nfs4_server_supports_acls(NFS_SB(dentry->d_sb), NFS4ACL_DACL);
7743 }
7744
7745 #define XATTR_NAME_NFSV4_SACL "system.nfs4_sacl"
7746
7747 static int nfs4_xattr_set_nfs4_sacl(const struct xattr_handler *handler,
7748                                     struct mnt_idmap *idmap,
7749                                     struct dentry *unused, struct inode *inode,
7750                                     const char *key, const void *buf,
7751                                     size_t buflen, int flags)
7752 {
7753         return nfs4_proc_set_acl(inode, buf, buflen, NFS4ACL_SACL);
7754 }
7755
7756 static int nfs4_xattr_get_nfs4_sacl(const struct xattr_handler *handler,
7757                                     struct dentry *unused, struct inode *inode,
7758                                     const char *key, void *buf, size_t buflen)
7759 {
7760         return nfs4_proc_get_acl(inode, buf, buflen, NFS4ACL_SACL);
7761 }
7762
7763 static bool nfs4_xattr_list_nfs4_sacl(struct dentry *dentry)
7764 {
7765         return nfs4_server_supports_acls(NFS_SB(dentry->d_sb), NFS4ACL_SACL);
7766 }
7767
7768 #endif
7769
7770 #ifdef CONFIG_NFS_V4_SECURITY_LABEL
7771
7772 static int nfs4_xattr_set_nfs4_label(const struct xattr_handler *handler,
7773                                      struct mnt_idmap *idmap,
7774                                      struct dentry *unused, struct inode *inode,
7775                                      const char *key, const void *buf,
7776                                      size_t buflen, int flags)
7777 {
7778         if (security_ismaclabel(key))
7779                 return nfs4_set_security_label(inode, buf, buflen);
7780
7781         return -EOPNOTSUPP;
7782 }
7783
7784 static int nfs4_xattr_get_nfs4_label(const struct xattr_handler *handler,
7785                                      struct dentry *unused, struct inode *inode,
7786                                      const char *key, void *buf, size_t buflen)
7787 {
7788         if (security_ismaclabel(key))
7789                 return nfs4_get_security_label(inode, buf, buflen);
7790         return -EOPNOTSUPP;
7791 }
7792
7793 static ssize_t
7794 nfs4_listxattr_nfs4_label(struct inode *inode, char *list, size_t list_len)
7795 {
7796         int len = 0;
7797
7798         if (nfs_server_capable(inode, NFS_CAP_SECURITY_LABEL)) {
7799                 len = security_inode_listsecurity(inode, list, list_len);
7800                 if (len >= 0 && list_len && len > list_len)
7801                         return -ERANGE;
7802         }
7803         return len;
7804 }
7805
7806 static const struct xattr_handler nfs4_xattr_nfs4_label_handler = {
7807         .prefix = XATTR_SECURITY_PREFIX,
7808         .get    = nfs4_xattr_get_nfs4_label,
7809         .set    = nfs4_xattr_set_nfs4_label,
7810 };
7811
7812 #else
7813
7814 static ssize_t
7815 nfs4_listxattr_nfs4_label(struct inode *inode, char *list, size_t list_len)
7816 {
7817         return 0;
7818 }
7819
7820 #endif
7821
7822 #ifdef CONFIG_NFS_V4_2
7823 static int nfs4_xattr_set_nfs4_user(const struct xattr_handler *handler,
7824                                     struct mnt_idmap *idmap,
7825                                     struct dentry *unused, struct inode *inode,
7826                                     const char *key, const void *buf,
7827                                     size_t buflen, int flags)
7828 {
7829         u32 mask;
7830         int ret;
7831
7832         if (!nfs_server_capable(inode, NFS_CAP_XATTR))
7833                 return -EOPNOTSUPP;
7834
7835         /*
7836          * There is no mapping from the MAY_* flags to the NFS_ACCESS_XA*
7837          * flags right now. Handling of xattr operations use the normal
7838          * file read/write permissions.
7839          *
7840          * Just in case the server has other ideas (which RFC 8276 allows),
7841          * do a cached access check for the XA* flags to possibly avoid
7842          * doing an RPC and getting EACCES back.
7843          */
7844         if (!nfs_access_get_cached(inode, current_cred(), &mask, true)) {
7845                 if (!(mask & NFS_ACCESS_XAWRITE))
7846                         return -EACCES;
7847         }
7848
7849         if (buf == NULL) {
7850                 ret = nfs42_proc_removexattr(inode, key);
7851                 if (!ret)
7852                         nfs4_xattr_cache_remove(inode, key);
7853         } else {
7854                 ret = nfs42_proc_setxattr(inode, key, buf, buflen, flags);
7855                 if (!ret)
7856                         nfs4_xattr_cache_add(inode, key, buf, NULL, buflen);
7857         }
7858
7859         return ret;
7860 }
7861
7862 static int nfs4_xattr_get_nfs4_user(const struct xattr_handler *handler,
7863                                     struct dentry *unused, struct inode *inode,
7864                                     const char *key, void *buf, size_t buflen)
7865 {
7866         u32 mask;
7867         ssize_t ret;
7868
7869         if (!nfs_server_capable(inode, NFS_CAP_XATTR))
7870                 return -EOPNOTSUPP;
7871
7872         if (!nfs_access_get_cached(inode, current_cred(), &mask, true)) {
7873                 if (!(mask & NFS_ACCESS_XAREAD))
7874                         return -EACCES;
7875         }
7876
7877         ret = nfs_revalidate_inode(inode, NFS_INO_INVALID_CHANGE);
7878         if (ret)
7879                 return ret;
7880
7881         ret = nfs4_xattr_cache_get(inode, key, buf, buflen);
7882         if (ret >= 0 || (ret < 0 && ret != -ENOENT))
7883                 return ret;
7884
7885         ret = nfs42_proc_getxattr(inode, key, buf, buflen);
7886
7887         return ret;
7888 }
7889
7890 static ssize_t
7891 nfs4_listxattr_nfs4_user(struct inode *inode, char *list, size_t list_len)
7892 {
7893         u64 cookie;
7894         bool eof;
7895         ssize_t ret, size;
7896         char *buf;
7897         size_t buflen;
7898         u32 mask;
7899
7900         if (!nfs_server_capable(inode, NFS_CAP_XATTR))
7901                 return 0;
7902
7903         if (!nfs_access_get_cached(inode, current_cred(), &mask, true)) {
7904                 if (!(mask & NFS_ACCESS_XALIST))
7905                         return 0;
7906         }
7907
7908         ret = nfs_revalidate_inode(inode, NFS_INO_INVALID_CHANGE);
7909         if (ret)
7910                 return ret;
7911
7912         ret = nfs4_xattr_cache_list(inode, list, list_len);
7913         if (ret >= 0 || (ret < 0 && ret != -ENOENT))
7914                 return ret;
7915
7916         cookie = 0;
7917         eof = false;
7918         buflen = list_len ? list_len : XATTR_LIST_MAX;
7919         buf = list_len ? list : NULL;
7920         size = 0;
7921
7922         while (!eof) {
7923                 ret = nfs42_proc_listxattrs(inode, buf, buflen,
7924                     &cookie, &eof);
7925                 if (ret < 0)
7926                         return ret;
7927
7928                 if (list_len) {
7929                         buf += ret;
7930                         buflen -= ret;
7931                 }
7932                 size += ret;
7933         }
7934
7935         if (list_len)
7936                 nfs4_xattr_cache_set_list(inode, list, size);
7937
7938         return size;
7939 }
7940
7941 #else
7942
7943 static ssize_t
7944 nfs4_listxattr_nfs4_user(struct inode *inode, char *list, size_t list_len)
7945 {
7946         return 0;
7947 }
7948 #endif /* CONFIG_NFS_V4_2 */
7949
7950 /*
7951  * nfs_fhget will use either the mounted_on_fileid or the fileid
7952  */
7953 static void nfs_fixup_referral_attributes(struct nfs_fattr *fattr)
7954 {
7955         if (!(((fattr->valid & NFS_ATTR_FATTR_MOUNTED_ON_FILEID) ||
7956                (fattr->valid & NFS_ATTR_FATTR_FILEID)) &&
7957               (fattr->valid & NFS_ATTR_FATTR_FSID) &&
7958               (fattr->valid & NFS_ATTR_FATTR_V4_LOCATIONS)))
7959                 return;
7960
7961         fattr->valid |= NFS_ATTR_FATTR_TYPE | NFS_ATTR_FATTR_MODE |
7962                 NFS_ATTR_FATTR_NLINK | NFS_ATTR_FATTR_V4_REFERRAL;
7963         fattr->mode = S_IFDIR | S_IRUGO | S_IXUGO;
7964         fattr->nlink = 2;
7965 }
7966
7967 static int _nfs4_proc_fs_locations(struct rpc_clnt *client, struct inode *dir,
7968                                    const struct qstr *name,
7969                                    struct nfs4_fs_locations *fs_locations,
7970                                    struct page *page)
7971 {
7972         struct nfs_server *server = NFS_SERVER(dir);
7973         u32 bitmask[3];
7974         struct nfs4_fs_locations_arg args = {
7975                 .dir_fh = NFS_FH(dir),
7976                 .name = name,
7977                 .page = page,
7978                 .bitmask = bitmask,
7979         };
7980         struct nfs4_fs_locations_res res = {
7981                 .fs_locations = fs_locations,
7982         };
7983         struct rpc_message msg = {
7984                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FS_LOCATIONS],
7985                 .rpc_argp = &args,
7986                 .rpc_resp = &res,
7987         };
7988         int status;
7989
7990         dprintk("%s: start\n", __func__);
7991
7992         bitmask[0] = nfs4_fattr_bitmap[0] | FATTR4_WORD0_FS_LOCATIONS;
7993         bitmask[1] = nfs4_fattr_bitmap[1];
7994
7995         /* Ask for the fileid of the absent filesystem if mounted_on_fileid
7996          * is not supported */
7997         if (NFS_SERVER(dir)->attr_bitmask[1] & FATTR4_WORD1_MOUNTED_ON_FILEID)
7998                 bitmask[0] &= ~FATTR4_WORD0_FILEID;
7999         else
8000                 bitmask[1] &= ~FATTR4_WORD1_MOUNTED_ON_FILEID;
8001
8002         nfs_fattr_init(fs_locations->fattr);
8003         fs_locations->server = server;
8004         fs_locations->nlocations = 0;
8005         status = nfs4_call_sync(client, server, &msg, &args.seq_args, &res.seq_res, 0);
8006         dprintk("%s: returned status = %d\n", __func__, status);
8007         return status;
8008 }
8009
8010 int nfs4_proc_fs_locations(struct rpc_clnt *client, struct inode *dir,
8011                            const struct qstr *name,
8012                            struct nfs4_fs_locations *fs_locations,
8013                            struct page *page)
8014 {
8015         struct nfs4_exception exception = {
8016                 .interruptible = true,
8017         };
8018         int err;
8019         do {
8020                 err = _nfs4_proc_fs_locations(client, dir, name,
8021                                 fs_locations, page);
8022                 trace_nfs4_get_fs_locations(dir, name, err);
8023                 err = nfs4_handle_exception(NFS_SERVER(dir), err,
8024                                 &exception);
8025         } while (exception.retry);
8026         return err;
8027 }
8028
8029 /*
8030  * This operation also signals the server that this client is
8031  * performing migration recovery.  The server can stop returning
8032  * NFS4ERR_LEASE_MOVED to this client.  A RENEW operation is
8033  * appended to this compound to identify the client ID which is
8034  * performing recovery.
8035  */
8036 static int _nfs40_proc_get_locations(struct nfs_server *server,
8037                                      struct nfs_fh *fhandle,
8038                                      struct nfs4_fs_locations *locations,
8039                                      struct page *page, const struct cred *cred)
8040 {
8041         struct rpc_clnt *clnt = server->client;
8042         u32 bitmask[2] = {
8043                 [0] = FATTR4_WORD0_FSID | FATTR4_WORD0_FS_LOCATIONS,
8044         };
8045         struct nfs4_fs_locations_arg args = {
8046                 .clientid       = server->nfs_client->cl_clientid,
8047                 .fh             = fhandle,
8048                 .page           = page,
8049                 .bitmask        = bitmask,
8050                 .migration      = 1,            /* skip LOOKUP */
8051                 .renew          = 1,            /* append RENEW */
8052         };
8053         struct nfs4_fs_locations_res res = {
8054                 .fs_locations   = locations,
8055                 .migration      = 1,
8056                 .renew          = 1,
8057         };
8058         struct rpc_message msg = {
8059                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_FS_LOCATIONS],
8060                 .rpc_argp       = &args,
8061                 .rpc_resp       = &res,
8062                 .rpc_cred       = cred,
8063         };
8064         unsigned long now = jiffies;
8065         int status;
8066
8067         nfs_fattr_init(locations->fattr);
8068         locations->server = server;
8069         locations->nlocations = 0;
8070
8071         nfs4_init_sequence(&args.seq_args, &res.seq_res, 0, 1);
8072         status = nfs4_call_sync_sequence(clnt, server, &msg,
8073                                         &args.seq_args, &res.seq_res);
8074         if (status)
8075                 return status;
8076
8077         renew_lease(server, now);
8078         return 0;
8079 }
8080
8081 #ifdef CONFIG_NFS_V4_1
8082
8083 /*
8084  * This operation also signals the server that this client is
8085  * performing migration recovery.  The server can stop asserting
8086  * SEQ4_STATUS_LEASE_MOVED for this client.  The client ID
8087  * performing this operation is identified in the SEQUENCE
8088  * operation in this compound.
8089  *
8090  * When the client supports GETATTR(fs_locations_info), it can
8091  * be plumbed in here.
8092  */
8093 static int _nfs41_proc_get_locations(struct nfs_server *server,
8094                                      struct nfs_fh *fhandle,
8095                                      struct nfs4_fs_locations *locations,
8096                                      struct page *page, const struct cred *cred)
8097 {
8098         struct rpc_clnt *clnt = server->client;
8099         u32 bitmask[2] = {
8100                 [0] = FATTR4_WORD0_FSID | FATTR4_WORD0_FS_LOCATIONS,
8101         };
8102         struct nfs4_fs_locations_arg args = {
8103                 .fh             = fhandle,
8104                 .page           = page,
8105                 .bitmask        = bitmask,
8106                 .migration      = 1,            /* skip LOOKUP */
8107         };
8108         struct nfs4_fs_locations_res res = {
8109                 .fs_locations   = locations,
8110                 .migration      = 1,
8111         };
8112         struct rpc_message msg = {
8113                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_FS_LOCATIONS],
8114                 .rpc_argp       = &args,
8115                 .rpc_resp       = &res,
8116                 .rpc_cred       = cred,
8117         };
8118         struct nfs4_call_sync_data data = {
8119                 .seq_server = server,
8120                 .seq_args = &args.seq_args,
8121                 .seq_res = &res.seq_res,
8122         };
8123         struct rpc_task_setup task_setup_data = {
8124                 .rpc_client = clnt,
8125                 .rpc_message = &msg,
8126                 .callback_ops = server->nfs_client->cl_mvops->call_sync_ops,
8127                 .callback_data = &data,
8128                 .flags = RPC_TASK_NO_ROUND_ROBIN,
8129         };
8130         int status;
8131
8132         nfs_fattr_init(locations->fattr);
8133         locations->server = server;
8134         locations->nlocations = 0;
8135
8136         nfs4_init_sequence(&args.seq_args, &res.seq_res, 0, 1);
8137         status = nfs4_call_sync_custom(&task_setup_data);
8138         if (status == NFS4_OK &&
8139             res.seq_res.sr_status_flags & SEQ4_STATUS_LEASE_MOVED)
8140                 status = -NFS4ERR_LEASE_MOVED;
8141         return status;
8142 }
8143
8144 #endif  /* CONFIG_NFS_V4_1 */
8145
8146 /**
8147  * nfs4_proc_get_locations - discover locations for a migrated FSID
8148  * @server: pointer to nfs_server to process
8149  * @fhandle: pointer to the kernel NFS client file handle
8150  * @locations: result of query
8151  * @page: buffer
8152  * @cred: credential to use for this operation
8153  *
8154  * Returns NFS4_OK on success, a negative NFS4ERR status code if the
8155  * operation failed, or a negative errno if a local error occurred.
8156  *
8157  * On success, "locations" is filled in, but if the server has
8158  * no locations information, NFS_ATTR_FATTR_V4_LOCATIONS is not
8159  * asserted.
8160  *
8161  * -NFS4ERR_LEASE_MOVED is returned if the server still has leases
8162  * from this client that require migration recovery.
8163  */
8164 int nfs4_proc_get_locations(struct nfs_server *server,
8165                             struct nfs_fh *fhandle,
8166                             struct nfs4_fs_locations *locations,
8167                             struct page *page, const struct cred *cred)
8168 {
8169         struct nfs_client *clp = server->nfs_client;
8170         const struct nfs4_mig_recovery_ops *ops =
8171                                         clp->cl_mvops->mig_recovery_ops;
8172         struct nfs4_exception exception = {
8173                 .interruptible = true,
8174         };
8175         int status;
8176
8177         dprintk("%s: FSID %llx:%llx on \"%s\"\n", __func__,
8178                 (unsigned long long)server->fsid.major,
8179                 (unsigned long long)server->fsid.minor,
8180                 clp->cl_hostname);
8181         nfs_display_fhandle(fhandle, __func__);
8182
8183         do {
8184                 status = ops->get_locations(server, fhandle, locations, page,
8185                                             cred);
8186                 if (status != -NFS4ERR_DELAY)
8187                         break;
8188                 nfs4_handle_exception(server, status, &exception);
8189         } while (exception.retry);
8190         return status;
8191 }
8192
8193 /*
8194  * This operation also signals the server that this client is
8195  * performing "lease moved" recovery.  The server can stop
8196  * returning NFS4ERR_LEASE_MOVED to this client.  A RENEW operation
8197  * is appended to this compound to identify the client ID which is
8198  * performing recovery.
8199  */
8200 static int _nfs40_proc_fsid_present(struct inode *inode, const struct cred *cred)
8201 {
8202         struct nfs_server *server = NFS_SERVER(inode);
8203         struct nfs_client *clp = NFS_SERVER(inode)->nfs_client;
8204         struct rpc_clnt *clnt = server->client;
8205         struct nfs4_fsid_present_arg args = {
8206                 .fh             = NFS_FH(inode),
8207                 .clientid       = clp->cl_clientid,
8208                 .renew          = 1,            /* append RENEW */
8209         };
8210         struct nfs4_fsid_present_res res = {
8211                 .renew          = 1,
8212         };
8213         struct rpc_message msg = {
8214                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_FSID_PRESENT],
8215                 .rpc_argp       = &args,
8216                 .rpc_resp       = &res,
8217                 .rpc_cred       = cred,
8218         };
8219         unsigned long now = jiffies;
8220         int status;
8221
8222         res.fh = nfs_alloc_fhandle();
8223         if (res.fh == NULL)
8224                 return -ENOMEM;
8225
8226         nfs4_init_sequence(&args.seq_args, &res.seq_res, 0, 1);
8227         status = nfs4_call_sync_sequence(clnt, server, &msg,
8228                                                 &args.seq_args, &res.seq_res);
8229         nfs_free_fhandle(res.fh);
8230         if (status)
8231                 return status;
8232
8233         do_renew_lease(clp, now);
8234         return 0;
8235 }
8236
8237 #ifdef CONFIG_NFS_V4_1
8238
8239 /*
8240  * This operation also signals the server that this client is
8241  * performing "lease moved" recovery.  The server can stop asserting
8242  * SEQ4_STATUS_LEASE_MOVED for this client.  The client ID performing
8243  * this operation is identified in the SEQUENCE operation in this
8244  * compound.
8245  */
8246 static int _nfs41_proc_fsid_present(struct inode *inode, const struct cred *cred)
8247 {
8248         struct nfs_server *server = NFS_SERVER(inode);
8249         struct rpc_clnt *clnt = server->client;
8250         struct nfs4_fsid_present_arg args = {
8251                 .fh             = NFS_FH(inode),
8252         };
8253         struct nfs4_fsid_present_res res = {
8254         };
8255         struct rpc_message msg = {
8256                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_FSID_PRESENT],
8257                 .rpc_argp       = &args,
8258                 .rpc_resp       = &res,
8259                 .rpc_cred       = cred,
8260         };
8261         int status;
8262
8263         res.fh = nfs_alloc_fhandle();
8264         if (res.fh == NULL)
8265                 return -ENOMEM;
8266
8267         nfs4_init_sequence(&args.seq_args, &res.seq_res, 0, 1);
8268         status = nfs4_call_sync_sequence(clnt, server, &msg,
8269                                                 &args.seq_args, &res.seq_res);
8270         nfs_free_fhandle(res.fh);
8271         if (status == NFS4_OK &&
8272             res.seq_res.sr_status_flags & SEQ4_STATUS_LEASE_MOVED)
8273                 status = -NFS4ERR_LEASE_MOVED;
8274         return status;
8275 }
8276
8277 #endif  /* CONFIG_NFS_V4_1 */
8278
8279 /**
8280  * nfs4_proc_fsid_present - Is this FSID present or absent on server?
8281  * @inode: inode on FSID to check
8282  * @cred: credential to use for this operation
8283  *
8284  * Server indicates whether the FSID is present, moved, or not
8285  * recognized.  This operation is necessary to clear a LEASE_MOVED
8286  * condition for this client ID.
8287  *
8288  * Returns NFS4_OK if the FSID is present on this server,
8289  * -NFS4ERR_MOVED if the FSID is no longer present, a negative
8290  *  NFS4ERR code if some error occurred on the server, or a
8291  *  negative errno if a local failure occurred.
8292  */
8293 int nfs4_proc_fsid_present(struct inode *inode, const struct cred *cred)
8294 {
8295         struct nfs_server *server = NFS_SERVER(inode);
8296         struct nfs_client *clp = server->nfs_client;
8297         const struct nfs4_mig_recovery_ops *ops =
8298                                         clp->cl_mvops->mig_recovery_ops;
8299         struct nfs4_exception exception = {
8300                 .interruptible = true,
8301         };
8302         int status;
8303
8304         dprintk("%s: FSID %llx:%llx on \"%s\"\n", __func__,
8305                 (unsigned long long)server->fsid.major,
8306                 (unsigned long long)server->fsid.minor,
8307                 clp->cl_hostname);
8308         nfs_display_fhandle(NFS_FH(inode), __func__);
8309
8310         do {
8311                 status = ops->fsid_present(inode, cred);
8312                 if (status != -NFS4ERR_DELAY)
8313                         break;
8314                 nfs4_handle_exception(server, status, &exception);
8315         } while (exception.retry);
8316         return status;
8317 }
8318
8319 /*
8320  * If 'use_integrity' is true and the state managment nfs_client
8321  * cl_rpcclient is using krb5i/p, use the integrity protected cl_rpcclient
8322  * and the machine credential as per RFC3530bis and RFC5661 Security
8323  * Considerations sections. Otherwise, just use the user cred with the
8324  * filesystem's rpc_client.
8325  */
8326 static int _nfs4_proc_secinfo(struct inode *dir, const struct qstr *name, struct nfs4_secinfo_flavors *flavors, bool use_integrity)
8327 {
8328         int status;
8329         struct rpc_clnt *clnt = NFS_SERVER(dir)->client;
8330         struct nfs_client *clp = NFS_SERVER(dir)->nfs_client;
8331         struct nfs4_secinfo_arg args = {
8332                 .dir_fh = NFS_FH(dir),
8333                 .name   = name,
8334         };
8335         struct nfs4_secinfo_res res = {
8336                 .flavors     = flavors,
8337         };
8338         struct rpc_message msg = {
8339                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SECINFO],
8340                 .rpc_argp = &args,
8341                 .rpc_resp = &res,
8342         };
8343         struct nfs4_call_sync_data data = {
8344                 .seq_server = NFS_SERVER(dir),
8345                 .seq_args = &args.seq_args,
8346                 .seq_res = &res.seq_res,
8347         };
8348         struct rpc_task_setup task_setup = {
8349                 .rpc_client = clnt,
8350                 .rpc_message = &msg,
8351                 .callback_ops = clp->cl_mvops->call_sync_ops,
8352                 .callback_data = &data,
8353                 .flags = RPC_TASK_NO_ROUND_ROBIN,
8354         };
8355         const struct cred *cred = NULL;
8356
8357         if (use_integrity) {
8358                 clnt = clp->cl_rpcclient;
8359                 task_setup.rpc_client = clnt;
8360
8361                 cred = nfs4_get_clid_cred(clp);
8362                 msg.rpc_cred = cred;
8363         }
8364
8365         dprintk("NFS call  secinfo %s\n", name->name);
8366
8367         nfs4_state_protect(clp, NFS_SP4_MACH_CRED_SECINFO, &clnt, &msg);
8368         nfs4_init_sequence(&args.seq_args, &res.seq_res, 0, 0);
8369         status = nfs4_call_sync_custom(&task_setup);
8370
8371         dprintk("NFS reply  secinfo: %d\n", status);
8372
8373         put_cred(cred);
8374         return status;
8375 }
8376
8377 int nfs4_proc_secinfo(struct inode *dir, const struct qstr *name,
8378                       struct nfs4_secinfo_flavors *flavors)
8379 {
8380         struct nfs4_exception exception = {
8381                 .interruptible = true,
8382         };
8383         int err;
8384         do {
8385                 err = -NFS4ERR_WRONGSEC;
8386
8387                 /* try to use integrity protection with machine cred */
8388                 if (_nfs4_is_integrity_protected(NFS_SERVER(dir)->nfs_client))
8389                         err = _nfs4_proc_secinfo(dir, name, flavors, true);
8390
8391                 /*
8392                  * if unable to use integrity protection, or SECINFO with
8393                  * integrity protection returns NFS4ERR_WRONGSEC (which is
8394                  * disallowed by spec, but exists in deployed servers) use
8395                  * the current filesystem's rpc_client and the user cred.
8396                  */
8397                 if (err == -NFS4ERR_WRONGSEC)
8398                         err = _nfs4_proc_secinfo(dir, name, flavors, false);
8399
8400                 trace_nfs4_secinfo(dir, name, err);
8401                 err = nfs4_handle_exception(NFS_SERVER(dir), err,
8402                                 &exception);
8403         } while (exception.retry);
8404         return err;
8405 }
8406
8407 #ifdef CONFIG_NFS_V4_1
8408 /*
8409  * Check the exchange flags returned by the server for invalid flags, having
8410  * both PNFS and NON_PNFS flags set, and not having one of NON_PNFS, PNFS, or
8411  * DS flags set.
8412  */
8413 static int nfs4_check_cl_exchange_flags(u32 flags, u32 version)
8414 {
8415         if (version >= 2 && (flags & ~EXCHGID4_2_FLAG_MASK_R))
8416                 goto out_inval;
8417         else if (version < 2 && (flags & ~EXCHGID4_FLAG_MASK_R))
8418                 goto out_inval;
8419         if ((flags & EXCHGID4_FLAG_USE_PNFS_MDS) &&
8420             (flags & EXCHGID4_FLAG_USE_NON_PNFS))
8421                 goto out_inval;
8422         if (!(flags & (EXCHGID4_FLAG_MASK_PNFS)))
8423                 goto out_inval;
8424         return NFS_OK;
8425 out_inval:
8426         return -NFS4ERR_INVAL;
8427 }
8428
8429 static bool
8430 nfs41_same_server_scope(struct nfs41_server_scope *a,
8431                         struct nfs41_server_scope *b)
8432 {
8433         if (a->server_scope_sz != b->server_scope_sz)
8434                 return false;
8435         return memcmp(a->server_scope, b->server_scope, a->server_scope_sz) == 0;
8436 }
8437
8438 static void
8439 nfs4_bind_one_conn_to_session_done(struct rpc_task *task, void *calldata)
8440 {
8441         struct nfs41_bind_conn_to_session_args *args = task->tk_msg.rpc_argp;
8442         struct nfs41_bind_conn_to_session_res *res = task->tk_msg.rpc_resp;
8443         struct nfs_client *clp = args->client;
8444
8445         switch (task->tk_status) {
8446         case -NFS4ERR_BADSESSION:
8447         case -NFS4ERR_DEADSESSION:
8448                 nfs4_schedule_session_recovery(clp->cl_session,
8449                                 task->tk_status);
8450                 return;
8451         }
8452         if (args->dir == NFS4_CDFC4_FORE_OR_BOTH &&
8453                         res->dir != NFS4_CDFS4_BOTH) {
8454                 rpc_task_close_connection(task);
8455                 if (args->retries++ < MAX_BIND_CONN_TO_SESSION_RETRIES)
8456                         rpc_restart_call(task);
8457         }
8458 }
8459
8460 static const struct rpc_call_ops nfs4_bind_one_conn_to_session_ops = {
8461         .rpc_call_done =  nfs4_bind_one_conn_to_session_done,
8462 };
8463
8464 /*
8465  * nfs4_proc_bind_one_conn_to_session()
8466  *
8467  * The 4.1 client currently uses the same TCP connection for the
8468  * fore and backchannel.
8469  */
8470 static
8471 int nfs4_proc_bind_one_conn_to_session(struct rpc_clnt *clnt,
8472                 struct rpc_xprt *xprt,
8473                 struct nfs_client *clp,
8474                 const struct cred *cred)
8475 {
8476         int status;
8477         struct nfs41_bind_conn_to_session_args args = {
8478                 .client = clp,
8479                 .dir = NFS4_CDFC4_FORE_OR_BOTH,
8480                 .retries = 0,
8481         };
8482         struct nfs41_bind_conn_to_session_res res;
8483         struct rpc_message msg = {
8484                 .rpc_proc =
8485                         &nfs4_procedures[NFSPROC4_CLNT_BIND_CONN_TO_SESSION],
8486                 .rpc_argp = &args,
8487                 .rpc_resp = &res,
8488                 .rpc_cred = cred,
8489         };
8490         struct rpc_task_setup task_setup_data = {
8491                 .rpc_client = clnt,
8492                 .rpc_xprt = xprt,
8493                 .callback_ops = &nfs4_bind_one_conn_to_session_ops,
8494                 .rpc_message = &msg,
8495                 .flags = RPC_TASK_TIMEOUT,
8496         };
8497         struct rpc_task *task;
8498
8499         nfs4_copy_sessionid(&args.sessionid, &clp->cl_session->sess_id);
8500         if (!(clp->cl_session->flags & SESSION4_BACK_CHAN))
8501                 args.dir = NFS4_CDFC4_FORE;
8502
8503         /* Do not set the backchannel flag unless this is clnt->cl_xprt */
8504         if (xprt != rcu_access_pointer(clnt->cl_xprt))
8505                 args.dir = NFS4_CDFC4_FORE;
8506
8507         task = rpc_run_task(&task_setup_data);
8508         if (!IS_ERR(task)) {
8509                 status = task->tk_status;
8510                 rpc_put_task(task);
8511         } else
8512                 status = PTR_ERR(task);
8513         trace_nfs4_bind_conn_to_session(clp, status);
8514         if (status == 0) {
8515                 if (memcmp(res.sessionid.data,
8516                     clp->cl_session->sess_id.data, NFS4_MAX_SESSIONID_LEN)) {
8517                         dprintk("NFS: %s: Session ID mismatch\n", __func__);
8518                         return -EIO;
8519                 }
8520                 if ((res.dir & args.dir) != res.dir || res.dir == 0) {
8521                         dprintk("NFS: %s: Unexpected direction from server\n",
8522                                 __func__);
8523                         return -EIO;
8524                 }
8525                 if (res.use_conn_in_rdma_mode != args.use_conn_in_rdma_mode) {
8526                         dprintk("NFS: %s: Server returned RDMA mode = true\n",
8527                                 __func__);
8528                         return -EIO;
8529                 }
8530         }
8531
8532         return status;
8533 }
8534
8535 struct rpc_bind_conn_calldata {
8536         struct nfs_client *clp;
8537         const struct cred *cred;
8538 };
8539
8540 static int
8541 nfs4_proc_bind_conn_to_session_callback(struct rpc_clnt *clnt,
8542                 struct rpc_xprt *xprt,
8543                 void *calldata)
8544 {
8545         struct rpc_bind_conn_calldata *p = calldata;
8546
8547         return nfs4_proc_bind_one_conn_to_session(clnt, xprt, p->clp, p->cred);
8548 }
8549
8550 int nfs4_proc_bind_conn_to_session(struct nfs_client *clp, const struct cred *cred)
8551 {
8552         struct rpc_bind_conn_calldata data = {
8553                 .clp = clp,
8554                 .cred = cred,
8555         };
8556         return rpc_clnt_iterate_for_each_xprt(clp->cl_rpcclient,
8557                         nfs4_proc_bind_conn_to_session_callback, &data);
8558 }
8559
8560 /*
8561  * Minimum set of SP4_MACH_CRED operations from RFC 5661 in the enforce map
8562  * and operations we'd like to see to enable certain features in the allow map
8563  */
8564 static const struct nfs41_state_protection nfs4_sp4_mach_cred_request = {
8565         .how = SP4_MACH_CRED,
8566         .enforce.u.words = {
8567                 [1] = 1 << (OP_BIND_CONN_TO_SESSION - 32) |
8568                       1 << (OP_EXCHANGE_ID - 32) |
8569                       1 << (OP_CREATE_SESSION - 32) |
8570                       1 << (OP_DESTROY_SESSION - 32) |
8571                       1 << (OP_DESTROY_CLIENTID - 32)
8572         },
8573         .allow.u.words = {
8574                 [0] = 1 << (OP_CLOSE) |
8575                       1 << (OP_OPEN_DOWNGRADE) |
8576                       1 << (OP_LOCKU) |
8577                       1 << (OP_DELEGRETURN) |
8578                       1 << (OP_COMMIT),
8579                 [1] = 1 << (OP_SECINFO - 32) |
8580                       1 << (OP_SECINFO_NO_NAME - 32) |
8581                       1 << (OP_LAYOUTRETURN - 32) |
8582                       1 << (OP_TEST_STATEID - 32) |
8583                       1 << (OP_FREE_STATEID - 32) |
8584                       1 << (OP_WRITE - 32)
8585         }
8586 };
8587
8588 /*
8589  * Select the state protection mode for client `clp' given the server results
8590  * from exchange_id in `sp'.
8591  *
8592  * Returns 0 on success, negative errno otherwise.
8593  */
8594 static int nfs4_sp4_select_mode(struct nfs_client *clp,
8595                                  struct nfs41_state_protection *sp)
8596 {
8597         static const u32 supported_enforce[NFS4_OP_MAP_NUM_WORDS] = {
8598                 [1] = 1 << (OP_BIND_CONN_TO_SESSION - 32) |
8599                       1 << (OP_EXCHANGE_ID - 32) |
8600                       1 << (OP_CREATE_SESSION - 32) |
8601                       1 << (OP_DESTROY_SESSION - 32) |
8602                       1 << (OP_DESTROY_CLIENTID - 32)
8603         };
8604         unsigned long flags = 0;
8605         unsigned int i;
8606         int ret = 0;
8607
8608         if (sp->how == SP4_MACH_CRED) {
8609                 /* Print state protect result */
8610                 dfprintk(MOUNT, "Server SP4_MACH_CRED support:\n");
8611                 for (i = 0; i <= LAST_NFS4_OP; i++) {
8612                         if (test_bit(i, sp->enforce.u.longs))
8613                                 dfprintk(MOUNT, "  enforce op %d\n", i);
8614                         if (test_bit(i, sp->allow.u.longs))
8615                                 dfprintk(MOUNT, "  allow op %d\n", i);
8616                 }
8617
8618                 /* make sure nothing is on enforce list that isn't supported */
8619                 for (i = 0; i < NFS4_OP_MAP_NUM_WORDS; i++) {
8620                         if (sp->enforce.u.words[i] & ~supported_enforce[i]) {
8621                                 dfprintk(MOUNT, "sp4_mach_cred: disabled\n");
8622                                 ret = -EINVAL;
8623                                 goto out;
8624                         }
8625                 }
8626
8627                 /*
8628                  * Minimal mode - state operations are allowed to use machine
8629                  * credential.  Note this already happens by default, so the
8630                  * client doesn't have to do anything more than the negotiation.
8631                  *
8632                  * NOTE: we don't care if EXCHANGE_ID is in the list -
8633                  *       we're already using the machine cred for exchange_id
8634                  *       and will never use a different cred.
8635                  */
8636                 if (test_bit(OP_BIND_CONN_TO_SESSION, sp->enforce.u.longs) &&
8637                     test_bit(OP_CREATE_SESSION, sp->enforce.u.longs) &&
8638                     test_bit(OP_DESTROY_SESSION, sp->enforce.u.longs) &&
8639                     test_bit(OP_DESTROY_CLIENTID, sp->enforce.u.longs)) {
8640                         dfprintk(MOUNT, "sp4_mach_cred:\n");
8641                         dfprintk(MOUNT, "  minimal mode enabled\n");
8642                         __set_bit(NFS_SP4_MACH_CRED_MINIMAL, &flags);
8643                 } else {
8644                         dfprintk(MOUNT, "sp4_mach_cred: disabled\n");
8645                         ret = -EINVAL;
8646                         goto out;
8647                 }
8648
8649                 if (test_bit(OP_CLOSE, sp->allow.u.longs) &&
8650                     test_bit(OP_OPEN_DOWNGRADE, sp->allow.u.longs) &&
8651                     test_bit(OP_DELEGRETURN, sp->allow.u.longs) &&
8652                     test_bit(OP_LOCKU, sp->allow.u.longs)) {
8653                         dfprintk(MOUNT, "  cleanup mode enabled\n");
8654                         __set_bit(NFS_SP4_MACH_CRED_CLEANUP, &flags);
8655                 }
8656
8657                 if (test_bit(OP_LAYOUTRETURN, sp->allow.u.longs)) {
8658                         dfprintk(MOUNT, "  pnfs cleanup mode enabled\n");
8659                         __set_bit(NFS_SP4_MACH_CRED_PNFS_CLEANUP, &flags);
8660                 }
8661
8662                 if (test_bit(OP_SECINFO, sp->allow.u.longs) &&
8663                     test_bit(OP_SECINFO_NO_NAME, sp->allow.u.longs)) {
8664                         dfprintk(MOUNT, "  secinfo mode enabled\n");
8665                         __set_bit(NFS_SP4_MACH_CRED_SECINFO, &flags);
8666                 }
8667
8668                 if (test_bit(OP_TEST_STATEID, sp->allow.u.longs) &&
8669                     test_bit(OP_FREE_STATEID, sp->allow.u.longs)) {
8670                         dfprintk(MOUNT, "  stateid mode enabled\n");
8671                         __set_bit(NFS_SP4_MACH_CRED_STATEID, &flags);
8672                 }
8673
8674                 if (test_bit(OP_WRITE, sp->allow.u.longs)) {
8675                         dfprintk(MOUNT, "  write mode enabled\n");
8676                         __set_bit(NFS_SP4_MACH_CRED_WRITE, &flags);
8677                 }
8678
8679                 if (test_bit(OP_COMMIT, sp->allow.u.longs)) {
8680                         dfprintk(MOUNT, "  commit mode enabled\n");
8681                         __set_bit(NFS_SP4_MACH_CRED_COMMIT, &flags);
8682                 }
8683         }
8684 out:
8685         clp->cl_sp4_flags = flags;
8686         return ret;
8687 }
8688
8689 struct nfs41_exchange_id_data {
8690         struct nfs41_exchange_id_res res;
8691         struct nfs41_exchange_id_args args;
8692 };
8693
8694 static void nfs4_exchange_id_release(void *data)
8695 {
8696         struct nfs41_exchange_id_data *cdata =
8697                                         (struct nfs41_exchange_id_data *)data;
8698
8699         nfs_put_client(cdata->args.client);
8700         kfree(cdata->res.impl_id);
8701         kfree(cdata->res.server_scope);
8702         kfree(cdata->res.server_owner);
8703         kfree(cdata);
8704 }
8705
8706 static const struct rpc_call_ops nfs4_exchange_id_call_ops = {
8707         .rpc_release = nfs4_exchange_id_release,
8708 };
8709
8710 /*
8711  * _nfs4_proc_exchange_id()
8712  *
8713  * Wrapper for EXCHANGE_ID operation.
8714  */
8715 static struct rpc_task *
8716 nfs4_run_exchange_id(struct nfs_client *clp, const struct cred *cred,
8717                         u32 sp4_how, struct rpc_xprt *xprt)
8718 {
8719         struct rpc_message msg = {
8720                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_EXCHANGE_ID],
8721                 .rpc_cred = cred,
8722         };
8723         struct rpc_task_setup task_setup_data = {
8724                 .rpc_client = clp->cl_rpcclient,
8725                 .callback_ops = &nfs4_exchange_id_call_ops,
8726                 .rpc_message = &msg,
8727                 .flags = RPC_TASK_TIMEOUT | RPC_TASK_NO_ROUND_ROBIN,
8728         };
8729         struct nfs41_exchange_id_data *calldata;
8730         int status;
8731
8732         if (!refcount_inc_not_zero(&clp->cl_count))
8733                 return ERR_PTR(-EIO);
8734
8735         status = -ENOMEM;
8736         calldata = kzalloc(sizeof(*calldata), GFP_NOFS);
8737         if (!calldata)
8738                 goto out;
8739
8740         nfs4_init_boot_verifier(clp, &calldata->args.verifier);
8741
8742         status = nfs4_init_uniform_client_string(clp);
8743         if (status)
8744                 goto out_calldata;
8745
8746         calldata->res.server_owner = kzalloc(sizeof(struct nfs41_server_owner),
8747                                                 GFP_NOFS);
8748         status = -ENOMEM;
8749         if (unlikely(calldata->res.server_owner == NULL))
8750                 goto out_calldata;
8751
8752         calldata->res.server_scope = kzalloc(sizeof(struct nfs41_server_scope),
8753                                         GFP_NOFS);
8754         if (unlikely(calldata->res.server_scope == NULL))
8755                 goto out_server_owner;
8756
8757         calldata->res.impl_id = kzalloc(sizeof(struct nfs41_impl_id), GFP_NOFS);
8758         if (unlikely(calldata->res.impl_id == NULL))
8759                 goto out_server_scope;
8760
8761         switch (sp4_how) {
8762         case SP4_NONE:
8763                 calldata->args.state_protect.how = SP4_NONE;
8764                 break;
8765
8766         case SP4_MACH_CRED:
8767                 calldata->args.state_protect = nfs4_sp4_mach_cred_request;
8768                 break;
8769
8770         default:
8771                 /* unsupported! */
8772                 WARN_ON_ONCE(1);
8773                 status = -EINVAL;
8774                 goto out_impl_id;
8775         }
8776         if (xprt) {
8777                 task_setup_data.rpc_xprt = xprt;
8778                 task_setup_data.flags |= RPC_TASK_SOFTCONN;
8779                 memcpy(calldata->args.verifier.data, clp->cl_confirm.data,
8780                                 sizeof(calldata->args.verifier.data));
8781         }
8782         calldata->args.client = clp;
8783         calldata->args.flags = EXCHGID4_FLAG_SUPP_MOVED_REFER |
8784         EXCHGID4_FLAG_BIND_PRINC_STATEID;
8785 #ifdef CONFIG_NFS_V4_1_MIGRATION
8786         calldata->args.flags |= EXCHGID4_FLAG_SUPP_MOVED_MIGR;
8787 #endif
8788         msg.rpc_argp = &calldata->args;
8789         msg.rpc_resp = &calldata->res;
8790         task_setup_data.callback_data = calldata;
8791
8792         return rpc_run_task(&task_setup_data);
8793
8794 out_impl_id:
8795         kfree(calldata->res.impl_id);
8796 out_server_scope:
8797         kfree(calldata->res.server_scope);
8798 out_server_owner:
8799         kfree(calldata->res.server_owner);
8800 out_calldata:
8801         kfree(calldata);
8802 out:
8803         nfs_put_client(clp);
8804         return ERR_PTR(status);
8805 }
8806
8807 /*
8808  * _nfs4_proc_exchange_id()
8809  *
8810  * Wrapper for EXCHANGE_ID operation.
8811  */
8812 static int _nfs4_proc_exchange_id(struct nfs_client *clp, const struct cred *cred,
8813                         u32 sp4_how)
8814 {
8815         struct rpc_task *task;
8816         struct nfs41_exchange_id_args *argp;
8817         struct nfs41_exchange_id_res *resp;
8818         unsigned long now = jiffies;
8819         int status;
8820
8821         task = nfs4_run_exchange_id(clp, cred, sp4_how, NULL);
8822         if (IS_ERR(task))
8823                 return PTR_ERR(task);
8824
8825         argp = task->tk_msg.rpc_argp;
8826         resp = task->tk_msg.rpc_resp;
8827         status = task->tk_status;
8828         if (status  != 0)
8829                 goto out;
8830
8831         status = nfs4_check_cl_exchange_flags(resp->flags,
8832                         clp->cl_mvops->minor_version);
8833         if (status  != 0)
8834                 goto out;
8835
8836         status = nfs4_sp4_select_mode(clp, &resp->state_protect);
8837         if (status != 0)
8838                 goto out;
8839
8840         do_renew_lease(clp, now);
8841
8842         clp->cl_clientid = resp->clientid;
8843         clp->cl_exchange_flags = resp->flags;
8844         clp->cl_seqid = resp->seqid;
8845         /* Client ID is not confirmed */
8846         if (!(resp->flags & EXCHGID4_FLAG_CONFIRMED_R))
8847                 clear_bit(NFS4_SESSION_ESTABLISHED,
8848                           &clp->cl_session->session_state);
8849
8850         if (clp->cl_serverscope != NULL &&
8851             !nfs41_same_server_scope(clp->cl_serverscope,
8852                                 resp->server_scope)) {
8853                 dprintk("%s: server_scope mismatch detected\n",
8854                         __func__);
8855                 set_bit(NFS4CLNT_SERVER_SCOPE_MISMATCH, &clp->cl_state);
8856         }
8857
8858         swap(clp->cl_serverowner, resp->server_owner);
8859         swap(clp->cl_serverscope, resp->server_scope);
8860         swap(clp->cl_implid, resp->impl_id);
8861
8862         /* Save the EXCHANGE_ID verifier session trunk tests */
8863         memcpy(clp->cl_confirm.data, argp->verifier.data,
8864                sizeof(clp->cl_confirm.data));
8865 out:
8866         trace_nfs4_exchange_id(clp, status);
8867         rpc_put_task(task);
8868         return status;
8869 }
8870
8871 /*
8872  * nfs4_proc_exchange_id()
8873  *
8874  * Returns zero, a negative errno, or a negative NFS4ERR status code.
8875  *
8876  * Since the clientid has expired, all compounds using sessions
8877  * associated with the stale clientid will be returning
8878  * NFS4ERR_BADSESSION in the sequence operation, and will therefore
8879  * be in some phase of session reset.
8880  *
8881  * Will attempt to negotiate SP4_MACH_CRED if krb5i / krb5p auth is used.
8882  */
8883 int nfs4_proc_exchange_id(struct nfs_client *clp, const struct cred *cred)
8884 {
8885         rpc_authflavor_t authflavor = clp->cl_rpcclient->cl_auth->au_flavor;
8886         int status;
8887
8888         /* try SP4_MACH_CRED if krb5i/p */
8889         if (authflavor == RPC_AUTH_GSS_KRB5I ||
8890             authflavor == RPC_AUTH_GSS_KRB5P) {
8891                 status = _nfs4_proc_exchange_id(clp, cred, SP4_MACH_CRED);
8892                 if (!status)
8893                         return 0;
8894         }
8895
8896         /* try SP4_NONE */
8897         return _nfs4_proc_exchange_id(clp, cred, SP4_NONE);
8898 }
8899
8900 /**
8901  * nfs4_test_session_trunk
8902  *
8903  * This is an add_xprt_test() test function called from
8904  * rpc_clnt_setup_test_and_add_xprt.
8905  *
8906  * The rpc_xprt_switch is referrenced by rpc_clnt_setup_test_and_add_xprt
8907  * and is dereferrenced in nfs4_exchange_id_release
8908  *
8909  * Upon success, add the new transport to the rpc_clnt
8910  *
8911  * @clnt: struct rpc_clnt to get new transport
8912  * @xprt: the rpc_xprt to test
8913  * @data: call data for _nfs4_proc_exchange_id.
8914  */
8915 void nfs4_test_session_trunk(struct rpc_clnt *clnt, struct rpc_xprt *xprt,
8916                             void *data)
8917 {
8918         struct nfs4_add_xprt_data *adata = data;
8919         struct rpc_task *task;
8920         int status;
8921
8922         u32 sp4_how;
8923
8924         dprintk("--> %s try %s\n", __func__,
8925                 xprt->address_strings[RPC_DISPLAY_ADDR]);
8926
8927         sp4_how = (adata->clp->cl_sp4_flags == 0 ? SP4_NONE : SP4_MACH_CRED);
8928
8929         /* Test connection for session trunking. Async exchange_id call */
8930         task = nfs4_run_exchange_id(adata->clp, adata->cred, sp4_how, xprt);
8931         if (IS_ERR(task))
8932                 return;
8933
8934         status = task->tk_status;
8935         if (status == 0)
8936                 status = nfs4_detect_session_trunking(adata->clp,
8937                                 task->tk_msg.rpc_resp, xprt);
8938
8939         if (status == 0)
8940                 rpc_clnt_xprt_switch_add_xprt(clnt, xprt);
8941         else if (rpc_clnt_xprt_switch_has_addr(clnt,
8942                                 (struct sockaddr *)&xprt->addr))
8943                 rpc_clnt_xprt_switch_remove_xprt(clnt, xprt);
8944
8945         rpc_put_task(task);
8946 }
8947 EXPORT_SYMBOL_GPL(nfs4_test_session_trunk);
8948
8949 static int _nfs4_proc_destroy_clientid(struct nfs_client *clp,
8950                 const struct cred *cred)
8951 {
8952         struct rpc_message msg = {
8953                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DESTROY_CLIENTID],
8954                 .rpc_argp = clp,
8955                 .rpc_cred = cred,
8956         };
8957         int status;
8958
8959         status = rpc_call_sync(clp->cl_rpcclient, &msg,
8960                                RPC_TASK_TIMEOUT | RPC_TASK_NO_ROUND_ROBIN);
8961         trace_nfs4_destroy_clientid(clp, status);
8962         if (status)
8963                 dprintk("NFS: Got error %d from the server %s on "
8964                         "DESTROY_CLIENTID.", status, clp->cl_hostname);
8965         return status;
8966 }
8967
8968 static int nfs4_proc_destroy_clientid(struct nfs_client *clp,
8969                 const struct cred *cred)
8970 {
8971         unsigned int loop;
8972         int ret;
8973
8974         for (loop = NFS4_MAX_LOOP_ON_RECOVER; loop != 0; loop--) {
8975                 ret = _nfs4_proc_destroy_clientid(clp, cred);
8976                 switch (ret) {
8977                 case -NFS4ERR_DELAY:
8978                 case -NFS4ERR_CLIENTID_BUSY:
8979                         ssleep(1);
8980                         break;
8981                 default:
8982                         return ret;
8983                 }
8984         }
8985         return 0;
8986 }
8987
8988 int nfs4_destroy_clientid(struct nfs_client *clp)
8989 {
8990         const struct cred *cred;
8991         int ret = 0;
8992
8993         if (clp->cl_mvops->minor_version < 1)
8994                 goto out;
8995         if (clp->cl_exchange_flags == 0)
8996                 goto out;
8997         if (clp->cl_preserve_clid)
8998                 goto out;
8999         cred = nfs4_get_clid_cred(clp);
9000         ret = nfs4_proc_destroy_clientid(clp, cred);
9001         put_cred(cred);
9002         switch (ret) {
9003         case 0:
9004         case -NFS4ERR_STALE_CLIENTID:
9005                 clp->cl_exchange_flags = 0;
9006         }
9007 out:
9008         return ret;
9009 }
9010
9011 #endif /* CONFIG_NFS_V4_1 */
9012
9013 struct nfs4_get_lease_time_data {
9014         struct nfs4_get_lease_time_args *args;
9015         struct nfs4_get_lease_time_res *res;
9016         struct nfs_client *clp;
9017 };
9018
9019 static void nfs4_get_lease_time_prepare(struct rpc_task *task,
9020                                         void *calldata)
9021 {
9022         struct nfs4_get_lease_time_data *data =
9023                         (struct nfs4_get_lease_time_data *)calldata;
9024
9025         /* just setup sequence, do not trigger session recovery
9026            since we're invoked within one */
9027         nfs4_setup_sequence(data->clp,
9028                         &data->args->la_seq_args,
9029                         &data->res->lr_seq_res,
9030                         task);
9031 }
9032
9033 /*
9034  * Called from nfs4_state_manager thread for session setup, so don't recover
9035  * from sequence operation or clientid errors.
9036  */
9037 static void nfs4_get_lease_time_done(struct rpc_task *task, void *calldata)
9038 {
9039         struct nfs4_get_lease_time_data *data =
9040                         (struct nfs4_get_lease_time_data *)calldata;
9041
9042         if (!nfs4_sequence_done(task, &data->res->lr_seq_res))
9043                 return;
9044         switch (task->tk_status) {
9045         case -NFS4ERR_DELAY:
9046         case -NFS4ERR_GRACE:
9047                 rpc_delay(task, NFS4_POLL_RETRY_MIN);
9048                 task->tk_status = 0;
9049                 fallthrough;
9050         case -NFS4ERR_RETRY_UNCACHED_REP:
9051                 rpc_restart_call_prepare(task);
9052                 return;
9053         }
9054 }
9055
9056 static const struct rpc_call_ops nfs4_get_lease_time_ops = {
9057         .rpc_call_prepare = nfs4_get_lease_time_prepare,
9058         .rpc_call_done = nfs4_get_lease_time_done,
9059 };
9060
9061 int nfs4_proc_get_lease_time(struct nfs_client *clp, struct nfs_fsinfo *fsinfo)
9062 {
9063         struct nfs4_get_lease_time_args args;
9064         struct nfs4_get_lease_time_res res = {
9065                 .lr_fsinfo = fsinfo,
9066         };
9067         struct nfs4_get_lease_time_data data = {
9068                 .args = &args,
9069                 .res = &res,
9070                 .clp = clp,
9071         };
9072         struct rpc_message msg = {
9073                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GET_LEASE_TIME],
9074                 .rpc_argp = &args,
9075                 .rpc_resp = &res,
9076         };
9077         struct rpc_task_setup task_setup = {
9078                 .rpc_client = clp->cl_rpcclient,
9079                 .rpc_message = &msg,
9080                 .callback_ops = &nfs4_get_lease_time_ops,
9081                 .callback_data = &data,
9082                 .flags = RPC_TASK_TIMEOUT,
9083         };
9084
9085         nfs4_init_sequence(&args.la_seq_args, &res.lr_seq_res, 0, 1);
9086         return nfs4_call_sync_custom(&task_setup);
9087 }
9088
9089 #ifdef CONFIG_NFS_V4_1
9090
9091 /*
9092  * Initialize the values to be used by the client in CREATE_SESSION
9093  * If nfs4_init_session set the fore channel request and response sizes,
9094  * use them.
9095  *
9096  * Set the back channel max_resp_sz_cached to zero to force the client to
9097  * always set csa_cachethis to FALSE because the current implementation
9098  * of the back channel DRC only supports caching the CB_SEQUENCE operation.
9099  */
9100 static void nfs4_init_channel_attrs(struct nfs41_create_session_args *args,
9101                                     struct rpc_clnt *clnt)
9102 {
9103         unsigned int max_rqst_sz, max_resp_sz;
9104         unsigned int max_bc_payload = rpc_max_bc_payload(clnt);
9105         unsigned int max_bc_slots = rpc_num_bc_slots(clnt);
9106
9107         max_rqst_sz = NFS_MAX_FILE_IO_SIZE + nfs41_maxwrite_overhead;
9108         max_resp_sz = NFS_MAX_FILE_IO_SIZE + nfs41_maxread_overhead;
9109
9110         /* Fore channel attributes */
9111         args->fc_attrs.max_rqst_sz = max_rqst_sz;
9112         args->fc_attrs.max_resp_sz = max_resp_sz;
9113         args->fc_attrs.max_ops = NFS4_MAX_OPS;
9114         args->fc_attrs.max_reqs = max_session_slots;
9115
9116         dprintk("%s: Fore Channel : max_rqst_sz=%u max_resp_sz=%u "
9117                 "max_ops=%u max_reqs=%u\n",
9118                 __func__,
9119                 args->fc_attrs.max_rqst_sz, args->fc_attrs.max_resp_sz,
9120                 args->fc_attrs.max_ops, args->fc_attrs.max_reqs);
9121
9122         /* Back channel attributes */
9123         args->bc_attrs.max_rqst_sz = max_bc_payload;
9124         args->bc_attrs.max_resp_sz = max_bc_payload;
9125         args->bc_attrs.max_resp_sz_cached = 0;
9126         args->bc_attrs.max_ops = NFS4_MAX_BACK_CHANNEL_OPS;
9127         args->bc_attrs.max_reqs = max_t(unsigned short, max_session_cb_slots, 1);
9128         if (args->bc_attrs.max_reqs > max_bc_slots)
9129                 args->bc_attrs.max_reqs = max_bc_slots;
9130
9131         dprintk("%s: Back Channel : max_rqst_sz=%u max_resp_sz=%u "
9132                 "max_resp_sz_cached=%u max_ops=%u max_reqs=%u\n",
9133                 __func__,
9134                 args->bc_attrs.max_rqst_sz, args->bc_attrs.max_resp_sz,
9135                 args->bc_attrs.max_resp_sz_cached, args->bc_attrs.max_ops,
9136                 args->bc_attrs.max_reqs);
9137 }
9138
9139 static int nfs4_verify_fore_channel_attrs(struct nfs41_create_session_args *args,
9140                 struct nfs41_create_session_res *res)
9141 {
9142         struct nfs4_channel_attrs *sent = &args->fc_attrs;
9143         struct nfs4_channel_attrs *rcvd = &res->fc_attrs;
9144
9145         if (rcvd->max_resp_sz > sent->max_resp_sz)
9146                 return -EINVAL;
9147         /*
9148          * Our requested max_ops is the minimum we need; we're not
9149          * prepared to break up compounds into smaller pieces than that.
9150          * So, no point even trying to continue if the server won't
9151          * cooperate:
9152          */
9153         if (rcvd->max_ops < sent->max_ops)
9154                 return -EINVAL;
9155         if (rcvd->max_reqs == 0)
9156                 return -EINVAL;
9157         if (rcvd->max_reqs > NFS4_MAX_SLOT_TABLE)
9158                 rcvd->max_reqs = NFS4_MAX_SLOT_TABLE;
9159         return 0;
9160 }
9161
9162 static int nfs4_verify_back_channel_attrs(struct nfs41_create_session_args *args,
9163                 struct nfs41_create_session_res *res)
9164 {
9165         struct nfs4_channel_attrs *sent = &args->bc_attrs;
9166         struct nfs4_channel_attrs *rcvd = &res->bc_attrs;
9167
9168         if (!(res->flags & SESSION4_BACK_CHAN))
9169                 goto out;
9170         if (rcvd->max_rqst_sz > sent->max_rqst_sz)
9171                 return -EINVAL;
9172         if (rcvd->max_resp_sz < sent->max_resp_sz)
9173                 return -EINVAL;
9174         if (rcvd->max_resp_sz_cached > sent->max_resp_sz_cached)
9175                 return -EINVAL;
9176         if (rcvd->max_ops > sent->max_ops)
9177                 return -EINVAL;
9178         if (rcvd->max_reqs > sent->max_reqs)
9179                 return -EINVAL;
9180 out:
9181         return 0;
9182 }
9183
9184 static int nfs4_verify_channel_attrs(struct nfs41_create_session_args *args,
9185                                      struct nfs41_create_session_res *res)
9186 {
9187         int ret;
9188
9189         ret = nfs4_verify_fore_channel_attrs(args, res);
9190         if (ret)
9191                 return ret;
9192         return nfs4_verify_back_channel_attrs(args, res);
9193 }
9194
9195 static void nfs4_update_session(struct nfs4_session *session,
9196                 struct nfs41_create_session_res *res)
9197 {
9198         nfs4_copy_sessionid(&session->sess_id, &res->sessionid);
9199         /* Mark client id and session as being confirmed */
9200         session->clp->cl_exchange_flags |= EXCHGID4_FLAG_CONFIRMED_R;
9201         set_bit(NFS4_SESSION_ESTABLISHED, &session->session_state);
9202         session->flags = res->flags;
9203         memcpy(&session->fc_attrs, &res->fc_attrs, sizeof(session->fc_attrs));
9204         if (res->flags & SESSION4_BACK_CHAN)
9205                 memcpy(&session->bc_attrs, &res->bc_attrs,
9206                                 sizeof(session->bc_attrs));
9207 }
9208
9209 static int _nfs4_proc_create_session(struct nfs_client *clp,
9210                 const struct cred *cred)
9211 {
9212         struct nfs4_session *session = clp->cl_session;
9213         struct nfs41_create_session_args args = {
9214                 .client = clp,
9215                 .clientid = clp->cl_clientid,
9216                 .seqid = clp->cl_seqid,
9217                 .cb_program = NFS4_CALLBACK,
9218         };
9219         struct nfs41_create_session_res res;
9220
9221         struct rpc_message msg = {
9222                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE_SESSION],
9223                 .rpc_argp = &args,
9224                 .rpc_resp = &res,
9225                 .rpc_cred = cred,
9226         };
9227         int status;
9228
9229         nfs4_init_channel_attrs(&args, clp->cl_rpcclient);
9230         args.flags = (SESSION4_PERSIST | SESSION4_BACK_CHAN);
9231
9232         status = rpc_call_sync(session->clp->cl_rpcclient, &msg,
9233                                RPC_TASK_TIMEOUT | RPC_TASK_NO_ROUND_ROBIN);
9234         trace_nfs4_create_session(clp, status);
9235
9236         switch (status) {
9237         case -NFS4ERR_STALE_CLIENTID:
9238         case -NFS4ERR_DELAY:
9239         case -ETIMEDOUT:
9240         case -EACCES:
9241         case -EAGAIN:
9242                 goto out;
9243         }
9244
9245         clp->cl_seqid++;
9246         if (!status) {
9247                 /* Verify the session's negotiated channel_attrs values */
9248                 status = nfs4_verify_channel_attrs(&args, &res);
9249                 /* Increment the clientid slot sequence id */
9250                 if (status)
9251                         goto out;
9252                 nfs4_update_session(session, &res);
9253         }
9254 out:
9255         return status;
9256 }
9257
9258 /*
9259  * Issues a CREATE_SESSION operation to the server.
9260  * It is the responsibility of the caller to verify the session is
9261  * expired before calling this routine.
9262  */
9263 int nfs4_proc_create_session(struct nfs_client *clp, const struct cred *cred)
9264 {
9265         int status;
9266         unsigned *ptr;
9267         struct nfs4_session *session = clp->cl_session;
9268         struct nfs4_add_xprt_data xprtdata = {
9269                 .clp = clp,
9270         };
9271         struct rpc_add_xprt_test rpcdata = {
9272                 .add_xprt_test = clp->cl_mvops->session_trunk,
9273                 .data = &xprtdata,
9274         };
9275
9276         dprintk("--> %s clp=%p session=%p\n", __func__, clp, session);
9277
9278         status = _nfs4_proc_create_session(clp, cred);
9279         if (status)
9280                 goto out;
9281
9282         /* Init or reset the session slot tables */
9283         status = nfs4_setup_session_slot_tables(session);
9284         dprintk("slot table setup returned %d\n", status);
9285         if (status)
9286                 goto out;
9287
9288         ptr = (unsigned *)&session->sess_id.data[0];
9289         dprintk("%s client>seqid %d sessionid %u:%u:%u:%u\n", __func__,
9290                 clp->cl_seqid, ptr[0], ptr[1], ptr[2], ptr[3]);
9291         rpc_clnt_probe_trunked_xprts(clp->cl_rpcclient, &rpcdata);
9292 out:
9293         return status;
9294 }
9295
9296 /*
9297  * Issue the over-the-wire RPC DESTROY_SESSION.
9298  * The caller must serialize access to this routine.
9299  */
9300 int nfs4_proc_destroy_session(struct nfs4_session *session,
9301                 const struct cred *cred)
9302 {
9303         struct rpc_message msg = {
9304                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DESTROY_SESSION],
9305                 .rpc_argp = session,
9306                 .rpc_cred = cred,
9307         };
9308         int status = 0;
9309
9310         /* session is still being setup */
9311         if (!test_and_clear_bit(NFS4_SESSION_ESTABLISHED, &session->session_state))
9312                 return 0;
9313
9314         status = rpc_call_sync(session->clp->cl_rpcclient, &msg,
9315                                RPC_TASK_TIMEOUT | RPC_TASK_NO_ROUND_ROBIN);
9316         trace_nfs4_destroy_session(session->clp, status);
9317
9318         if (status)
9319                 dprintk("NFS: Got error %d from the server on DESTROY_SESSION. "
9320                         "Session has been destroyed regardless...\n", status);
9321         rpc_clnt_manage_trunked_xprts(session->clp->cl_rpcclient);
9322         return status;
9323 }
9324
9325 /*
9326  * Renew the cl_session lease.
9327  */
9328 struct nfs4_sequence_data {
9329         struct nfs_client *clp;
9330         struct nfs4_sequence_args args;
9331         struct nfs4_sequence_res res;
9332 };
9333
9334 static void nfs41_sequence_release(void *data)
9335 {
9336         struct nfs4_sequence_data *calldata = data;
9337         struct nfs_client *clp = calldata->clp;
9338
9339         if (refcount_read(&clp->cl_count) > 1)
9340                 nfs4_schedule_state_renewal(clp);
9341         nfs_put_client(clp);
9342         kfree(calldata);
9343 }
9344
9345 static int nfs41_sequence_handle_errors(struct rpc_task *task, struct nfs_client *clp)
9346 {
9347         switch(task->tk_status) {
9348         case -NFS4ERR_DELAY:
9349                 rpc_delay(task, NFS4_POLL_RETRY_MAX);
9350                 return -EAGAIN;
9351         default:
9352                 nfs4_schedule_lease_recovery(clp);
9353         }
9354         return 0;
9355 }
9356
9357 static void nfs41_sequence_call_done(struct rpc_task *task, void *data)
9358 {
9359         struct nfs4_sequence_data *calldata = data;
9360         struct nfs_client *clp = calldata->clp;
9361
9362         if (!nfs41_sequence_done(task, task->tk_msg.rpc_resp))
9363                 return;
9364
9365         trace_nfs4_sequence(clp, task->tk_status);
9366         if (task->tk_status < 0) {
9367                 dprintk("%s ERROR %d\n", __func__, task->tk_status);
9368                 if (refcount_read(&clp->cl_count) == 1)
9369                         return;
9370
9371                 if (nfs41_sequence_handle_errors(task, clp) == -EAGAIN) {
9372                         rpc_restart_call_prepare(task);
9373                         return;
9374                 }
9375         }
9376         dprintk("%s rpc_cred %p\n", __func__, task->tk_msg.rpc_cred);
9377 }
9378
9379 static void nfs41_sequence_prepare(struct rpc_task *task, void *data)
9380 {
9381         struct nfs4_sequence_data *calldata = data;
9382         struct nfs_client *clp = calldata->clp;
9383         struct nfs4_sequence_args *args;
9384         struct nfs4_sequence_res *res;
9385
9386         args = task->tk_msg.rpc_argp;
9387         res = task->tk_msg.rpc_resp;
9388
9389         nfs4_setup_sequence(clp, args, res, task);
9390 }
9391
9392 static const struct rpc_call_ops nfs41_sequence_ops = {
9393         .rpc_call_done = nfs41_sequence_call_done,
9394         .rpc_call_prepare = nfs41_sequence_prepare,
9395         .rpc_release = nfs41_sequence_release,
9396 };
9397
9398 static struct rpc_task *_nfs41_proc_sequence(struct nfs_client *clp,
9399                 const struct cred *cred,
9400                 struct nfs4_slot *slot,
9401                 bool is_privileged)
9402 {
9403         struct nfs4_sequence_data *calldata;
9404         struct rpc_message msg = {
9405                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SEQUENCE],
9406                 .rpc_cred = cred,
9407         };
9408         struct rpc_task_setup task_setup_data = {
9409                 .rpc_client = clp->cl_rpcclient,
9410                 .rpc_message = &msg,
9411                 .callback_ops = &nfs41_sequence_ops,
9412                 .flags = RPC_TASK_ASYNC | RPC_TASK_TIMEOUT | RPC_TASK_MOVEABLE,
9413         };
9414         struct rpc_task *ret;
9415
9416         ret = ERR_PTR(-EIO);
9417         if (!refcount_inc_not_zero(&clp->cl_count))
9418                 goto out_err;
9419
9420         ret = ERR_PTR(-ENOMEM);
9421         calldata = kzalloc(sizeof(*calldata), GFP_KERNEL);
9422         if (calldata == NULL)
9423                 goto out_put_clp;
9424         nfs4_init_sequence(&calldata->args, &calldata->res, 0, is_privileged);
9425         nfs4_sequence_attach_slot(&calldata->args, &calldata->res, slot);
9426         msg.rpc_argp = &calldata->args;
9427         msg.rpc_resp = &calldata->res;
9428         calldata->clp = clp;
9429         task_setup_data.callback_data = calldata;
9430
9431         ret = rpc_run_task(&task_setup_data);
9432         if (IS_ERR(ret))
9433                 goto out_err;
9434         return ret;
9435 out_put_clp:
9436         nfs_put_client(clp);
9437 out_err:
9438         nfs41_release_slot(slot);
9439         return ret;
9440 }
9441
9442 static int nfs41_proc_async_sequence(struct nfs_client *clp, const struct cred *cred, unsigned renew_flags)
9443 {
9444         struct rpc_task *task;
9445         int ret = 0;
9446
9447         if ((renew_flags & NFS4_RENEW_TIMEOUT) == 0)
9448                 return -EAGAIN;
9449         task = _nfs41_proc_sequence(clp, cred, NULL, false);
9450         if (IS_ERR(task))
9451                 ret = PTR_ERR(task);
9452         else
9453                 rpc_put_task_async(task);
9454         dprintk("<-- %s status=%d\n", __func__, ret);
9455         return ret;
9456 }
9457
9458 static int nfs4_proc_sequence(struct nfs_client *clp, const struct cred *cred)
9459 {
9460         struct rpc_task *task;
9461         int ret;
9462
9463         task = _nfs41_proc_sequence(clp, cred, NULL, true);
9464         if (IS_ERR(task)) {
9465                 ret = PTR_ERR(task);
9466                 goto out;
9467         }
9468         ret = rpc_wait_for_completion_task(task);
9469         if (!ret)
9470                 ret = task->tk_status;
9471         rpc_put_task(task);
9472 out:
9473         dprintk("<-- %s status=%d\n", __func__, ret);
9474         return ret;
9475 }
9476
9477 struct nfs4_reclaim_complete_data {
9478         struct nfs_client *clp;
9479         struct nfs41_reclaim_complete_args arg;
9480         struct nfs41_reclaim_complete_res res;
9481 };
9482
9483 static void nfs4_reclaim_complete_prepare(struct rpc_task *task, void *data)
9484 {
9485         struct nfs4_reclaim_complete_data *calldata = data;
9486
9487         nfs4_setup_sequence(calldata->clp,
9488                         &calldata->arg.seq_args,
9489                         &calldata->res.seq_res,
9490                         task);
9491 }
9492
9493 static int nfs41_reclaim_complete_handle_errors(struct rpc_task *task, struct nfs_client *clp)
9494 {
9495         switch(task->tk_status) {
9496         case 0:
9497                 wake_up_all(&clp->cl_lock_waitq);
9498                 fallthrough;
9499         case -NFS4ERR_COMPLETE_ALREADY:
9500         case -NFS4ERR_WRONG_CRED: /* What to do here? */
9501                 break;
9502         case -NFS4ERR_DELAY:
9503                 rpc_delay(task, NFS4_POLL_RETRY_MAX);
9504                 fallthrough;
9505         case -NFS4ERR_RETRY_UNCACHED_REP:
9506         case -EACCES:
9507                 dprintk("%s: failed to reclaim complete error %d for server %s, retrying\n",
9508                         __func__, task->tk_status, clp->cl_hostname);
9509                 return -EAGAIN;
9510         case -NFS4ERR_BADSESSION:
9511         case -NFS4ERR_DEADSESSION:
9512         case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
9513                 break;
9514         default:
9515                 nfs4_schedule_lease_recovery(clp);
9516         }
9517         return 0;
9518 }
9519
9520 static void nfs4_reclaim_complete_done(struct rpc_task *task, void *data)
9521 {
9522         struct nfs4_reclaim_complete_data *calldata = data;
9523         struct nfs_client *clp = calldata->clp;
9524         struct nfs4_sequence_res *res = &calldata->res.seq_res;
9525
9526         if (!nfs41_sequence_done(task, res))
9527                 return;
9528
9529         trace_nfs4_reclaim_complete(clp, task->tk_status);
9530         if (nfs41_reclaim_complete_handle_errors(task, clp) == -EAGAIN) {
9531                 rpc_restart_call_prepare(task);
9532                 return;
9533         }
9534 }
9535
9536 static void nfs4_free_reclaim_complete_data(void *data)
9537 {
9538         struct nfs4_reclaim_complete_data *calldata = data;
9539
9540         kfree(calldata);
9541 }
9542
9543 static const struct rpc_call_ops nfs4_reclaim_complete_call_ops = {
9544         .rpc_call_prepare = nfs4_reclaim_complete_prepare,
9545         .rpc_call_done = nfs4_reclaim_complete_done,
9546         .rpc_release = nfs4_free_reclaim_complete_data,
9547 };
9548
9549 /*
9550  * Issue a global reclaim complete.
9551  */
9552 static int nfs41_proc_reclaim_complete(struct nfs_client *clp,
9553                 const struct cred *cred)
9554 {
9555         struct nfs4_reclaim_complete_data *calldata;
9556         struct rpc_message msg = {
9557                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RECLAIM_COMPLETE],
9558                 .rpc_cred = cred,
9559         };
9560         struct rpc_task_setup task_setup_data = {
9561                 .rpc_client = clp->cl_rpcclient,
9562                 .rpc_message = &msg,
9563                 .callback_ops = &nfs4_reclaim_complete_call_ops,
9564                 .flags = RPC_TASK_NO_ROUND_ROBIN,
9565         };
9566         int status = -ENOMEM;
9567
9568         calldata = kzalloc(sizeof(*calldata), GFP_NOFS);
9569         if (calldata == NULL)
9570                 goto out;
9571         calldata->clp = clp;
9572         calldata->arg.one_fs = 0;
9573
9574         nfs4_init_sequence(&calldata->arg.seq_args, &calldata->res.seq_res, 0, 1);
9575         msg.rpc_argp = &calldata->arg;
9576         msg.rpc_resp = &calldata->res;
9577         task_setup_data.callback_data = calldata;
9578         status = nfs4_call_sync_custom(&task_setup_data);
9579 out:
9580         dprintk("<-- %s status=%d\n", __func__, status);
9581         return status;
9582 }
9583
9584 static void
9585 nfs4_layoutget_prepare(struct rpc_task *task, void *calldata)
9586 {
9587         struct nfs4_layoutget *lgp = calldata;
9588         struct nfs_server *server = NFS_SERVER(lgp->args.inode);
9589
9590         nfs4_setup_sequence(server->nfs_client, &lgp->args.seq_args,
9591                                 &lgp->res.seq_res, task);
9592 }
9593
9594 static void nfs4_layoutget_done(struct rpc_task *task, void *calldata)
9595 {
9596         struct nfs4_layoutget *lgp = calldata;
9597
9598         nfs41_sequence_process(task, &lgp->res.seq_res);
9599 }
9600
9601 static int
9602 nfs4_layoutget_handle_exception(struct rpc_task *task,
9603                 struct nfs4_layoutget *lgp, struct nfs4_exception *exception)
9604 {
9605         struct inode *inode = lgp->args.inode;
9606         struct nfs_server *server = NFS_SERVER(inode);
9607         struct pnfs_layout_hdr *lo = lgp->lo;
9608         int nfs4err = task->tk_status;
9609         int err, status = 0;
9610         LIST_HEAD(head);
9611
9612         dprintk("--> %s tk_status => %d\n", __func__, -task->tk_status);
9613
9614         nfs4_sequence_free_slot(&lgp->res.seq_res);
9615
9616         switch (nfs4err) {
9617         case 0:
9618                 goto out;
9619
9620         /*
9621          * NFS4ERR_LAYOUTUNAVAILABLE means we are not supposed to use pnfs
9622          * on the file. set tk_status to -ENODATA to tell upper layer to
9623          * retry go inband.
9624          */
9625         case -NFS4ERR_LAYOUTUNAVAILABLE:
9626                 status = -ENODATA;
9627                 goto out;
9628         /*
9629          * NFS4ERR_BADLAYOUT means the MDS cannot return a layout of
9630          * length lgp->args.minlength != 0 (see RFC5661 section 18.43.3).
9631          */
9632         case -NFS4ERR_BADLAYOUT:
9633                 status = -EOVERFLOW;
9634                 goto out;
9635         /*
9636          * NFS4ERR_LAYOUTTRYLATER is a conflict with another client
9637          * (or clients) writing to the same RAID stripe except when
9638          * the minlength argument is 0 (see RFC5661 section 18.43.3).
9639          *
9640          * Treat it like we would RECALLCONFLICT -- we retry for a little
9641          * while, and then eventually give up.
9642          */
9643         case -NFS4ERR_LAYOUTTRYLATER:
9644                 if (lgp->args.minlength == 0) {
9645                         status = -EOVERFLOW;
9646                         goto out;
9647                 }
9648                 status = -EBUSY;
9649                 break;
9650         case -NFS4ERR_RECALLCONFLICT:
9651                 status = -ERECALLCONFLICT;
9652                 break;
9653         case -NFS4ERR_DELEG_REVOKED:
9654         case -NFS4ERR_ADMIN_REVOKED:
9655         case -NFS4ERR_EXPIRED:
9656         case -NFS4ERR_BAD_STATEID:
9657                 exception->timeout = 0;
9658                 spin_lock(&inode->i_lock);
9659                 /* If the open stateid was bad, then recover it. */
9660                 if (!lo || test_bit(NFS_LAYOUT_INVALID_STID, &lo->plh_flags) ||
9661                     !nfs4_stateid_match_other(&lgp->args.stateid, &lo->plh_stateid)) {
9662                         spin_unlock(&inode->i_lock);
9663                         exception->state = lgp->args.ctx->state;
9664                         exception->stateid = &lgp->args.stateid;
9665                         break;
9666                 }
9667
9668                 /*
9669                  * Mark the bad layout state as invalid, then retry
9670                  */
9671                 pnfs_mark_layout_stateid_invalid(lo, &head);
9672                 spin_unlock(&inode->i_lock);
9673                 nfs_commit_inode(inode, 0);
9674                 pnfs_free_lseg_list(&head);
9675                 status = -EAGAIN;
9676                 goto out;
9677         }
9678
9679         err = nfs4_handle_exception(server, nfs4err, exception);
9680         if (!status) {
9681                 if (exception->retry)
9682                         status = -EAGAIN;
9683                 else
9684                         status = err;
9685         }
9686 out:
9687         return status;
9688 }
9689
9690 size_t max_response_pages(struct nfs_server *server)
9691 {
9692         u32 max_resp_sz = server->nfs_client->cl_session->fc_attrs.max_resp_sz;
9693         return nfs_page_array_len(0, max_resp_sz);
9694 }
9695
9696 static void nfs4_layoutget_release(void *calldata)
9697 {
9698         struct nfs4_layoutget *lgp = calldata;
9699
9700         nfs4_sequence_free_slot(&lgp->res.seq_res);
9701         pnfs_layoutget_free(lgp);
9702 }
9703
9704 static const struct rpc_call_ops nfs4_layoutget_call_ops = {
9705         .rpc_call_prepare = nfs4_layoutget_prepare,
9706         .rpc_call_done = nfs4_layoutget_done,
9707         .rpc_release = nfs4_layoutget_release,
9708 };
9709
9710 struct pnfs_layout_segment *
9711 nfs4_proc_layoutget(struct nfs4_layoutget *lgp, long *timeout)
9712 {
9713         struct inode *inode = lgp->args.inode;
9714         struct nfs_server *server = NFS_SERVER(inode);
9715         struct rpc_task *task;
9716         struct rpc_message msg = {
9717                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTGET],
9718                 .rpc_argp = &lgp->args,
9719                 .rpc_resp = &lgp->res,
9720                 .rpc_cred = lgp->cred,
9721         };
9722         struct rpc_task_setup task_setup_data = {
9723                 .rpc_client = server->client,
9724                 .rpc_message = &msg,
9725                 .callback_ops = &nfs4_layoutget_call_ops,
9726                 .callback_data = lgp,
9727                 .flags = RPC_TASK_ASYNC | RPC_TASK_CRED_NOREF |
9728                          RPC_TASK_MOVEABLE,
9729         };
9730         struct pnfs_layout_segment *lseg = NULL;
9731         struct nfs4_exception exception = {
9732                 .inode = inode,
9733                 .timeout = *timeout,
9734         };
9735         int status = 0;
9736
9737         nfs4_init_sequence(&lgp->args.seq_args, &lgp->res.seq_res, 0, 0);
9738
9739         task = rpc_run_task(&task_setup_data);
9740         if (IS_ERR(task))
9741                 return ERR_CAST(task);
9742
9743         status = rpc_wait_for_completion_task(task);
9744         if (status != 0)
9745                 goto out;
9746
9747         if (task->tk_status < 0) {
9748                 status = nfs4_layoutget_handle_exception(task, lgp, &exception);
9749                 *timeout = exception.timeout;
9750         } else if (lgp->res.layoutp->len == 0) {
9751                 status = -EAGAIN;
9752                 *timeout = nfs4_update_delay(&exception.timeout);
9753         } else
9754                 lseg = pnfs_layout_process(lgp);
9755 out:
9756         trace_nfs4_layoutget(lgp->args.ctx,
9757                         &lgp->args.range,
9758                         &lgp->res.range,
9759                         &lgp->res.stateid,
9760                         status);
9761
9762         rpc_put_task(task);
9763         dprintk("<-- %s status=%d\n", __func__, status);
9764         if (status)
9765                 return ERR_PTR(status);
9766         return lseg;
9767 }
9768
9769 static void
9770 nfs4_layoutreturn_prepare(struct rpc_task *task, void *calldata)
9771 {
9772         struct nfs4_layoutreturn *lrp = calldata;
9773
9774         nfs4_setup_sequence(lrp->clp,
9775                         &lrp->args.seq_args,
9776                         &lrp->res.seq_res,
9777                         task);
9778         if (!pnfs_layout_is_valid(lrp->args.layout))
9779                 rpc_exit(task, 0);
9780 }
9781
9782 static void nfs4_layoutreturn_done(struct rpc_task *task, void *calldata)
9783 {
9784         struct nfs4_layoutreturn *lrp = calldata;
9785         struct nfs_server *server;
9786
9787         if (!nfs41_sequence_process(task, &lrp->res.seq_res))
9788                 return;
9789
9790         /*
9791          * Was there an RPC level error? Assume the call succeeded,
9792          * and that we need to release the layout
9793          */
9794         if (task->tk_rpc_status != 0 && RPC_WAS_SENT(task)) {
9795                 lrp->res.lrs_present = 0;
9796                 return;
9797         }
9798
9799         server = NFS_SERVER(lrp->args.inode);
9800         switch (task->tk_status) {
9801         case -NFS4ERR_OLD_STATEID:
9802                 if (nfs4_layout_refresh_old_stateid(&lrp->args.stateid,
9803                                         &lrp->args.range,
9804                                         lrp->args.inode))
9805                         goto out_restart;
9806                 fallthrough;
9807         default:
9808                 task->tk_status = 0;
9809                 fallthrough;
9810         case 0:
9811                 break;
9812         case -NFS4ERR_DELAY:
9813                 if (nfs4_async_handle_error(task, server, NULL, NULL) != -EAGAIN)
9814                         break;
9815                 goto out_restart;
9816         }
9817         return;
9818 out_restart:
9819         task->tk_status = 0;
9820         nfs4_sequence_free_slot(&lrp->res.seq_res);
9821         rpc_restart_call_prepare(task);
9822 }
9823
9824 static void nfs4_layoutreturn_release(void *calldata)
9825 {
9826         struct nfs4_layoutreturn *lrp = calldata;
9827         struct pnfs_layout_hdr *lo = lrp->args.layout;
9828
9829         pnfs_layoutreturn_free_lsegs(lo, &lrp->args.stateid, &lrp->args.range,
9830                         lrp->res.lrs_present ? &lrp->res.stateid : NULL);
9831         nfs4_sequence_free_slot(&lrp->res.seq_res);
9832         if (lrp->ld_private.ops && lrp->ld_private.ops->free)
9833                 lrp->ld_private.ops->free(&lrp->ld_private);
9834         pnfs_put_layout_hdr(lrp->args.layout);
9835         nfs_iput_and_deactive(lrp->inode);
9836         put_cred(lrp->cred);
9837         kfree(calldata);
9838 }
9839
9840 static const struct rpc_call_ops nfs4_layoutreturn_call_ops = {
9841         .rpc_call_prepare = nfs4_layoutreturn_prepare,
9842         .rpc_call_done = nfs4_layoutreturn_done,
9843         .rpc_release = nfs4_layoutreturn_release,
9844 };
9845
9846 int nfs4_proc_layoutreturn(struct nfs4_layoutreturn *lrp, bool sync)
9847 {
9848         struct rpc_task *task;
9849         struct rpc_message msg = {
9850                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTRETURN],
9851                 .rpc_argp = &lrp->args,
9852                 .rpc_resp = &lrp->res,
9853                 .rpc_cred = lrp->cred,
9854         };
9855         struct rpc_task_setup task_setup_data = {
9856                 .rpc_client = NFS_SERVER(lrp->args.inode)->client,
9857                 .rpc_message = &msg,
9858                 .callback_ops = &nfs4_layoutreturn_call_ops,
9859                 .callback_data = lrp,
9860                 .flags = RPC_TASK_MOVEABLE,
9861         };
9862         int status = 0;
9863
9864         nfs4_state_protect(NFS_SERVER(lrp->args.inode)->nfs_client,
9865                         NFS_SP4_MACH_CRED_PNFS_CLEANUP,
9866                         &task_setup_data.rpc_client, &msg);
9867
9868         lrp->inode = nfs_igrab_and_active(lrp->args.inode);
9869         if (!sync) {
9870                 if (!lrp->inode) {
9871                         nfs4_layoutreturn_release(lrp);
9872                         return -EAGAIN;
9873                 }
9874                 task_setup_data.flags |= RPC_TASK_ASYNC;
9875         }
9876         if (!lrp->inode)
9877                 nfs4_init_sequence(&lrp->args.seq_args, &lrp->res.seq_res, 1,
9878                                    1);
9879         else
9880                 nfs4_init_sequence(&lrp->args.seq_args, &lrp->res.seq_res, 1,
9881                                    0);
9882         task = rpc_run_task(&task_setup_data);
9883         if (IS_ERR(task))
9884                 return PTR_ERR(task);
9885         if (sync)
9886                 status = task->tk_status;
9887         trace_nfs4_layoutreturn(lrp->args.inode, &lrp->args.stateid, status);
9888         dprintk("<-- %s status=%d\n", __func__, status);
9889         rpc_put_task(task);
9890         return status;
9891 }
9892
9893 static int
9894 _nfs4_proc_getdeviceinfo(struct nfs_server *server,
9895                 struct pnfs_device *pdev,
9896                 const struct cred *cred)
9897 {
9898         struct nfs4_getdeviceinfo_args args = {
9899                 .pdev = pdev,
9900                 .notify_types = NOTIFY_DEVICEID4_CHANGE |
9901                         NOTIFY_DEVICEID4_DELETE,
9902         };
9903         struct nfs4_getdeviceinfo_res res = {
9904                 .pdev = pdev,
9905         };
9906         struct rpc_message msg = {
9907                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETDEVICEINFO],
9908                 .rpc_argp = &args,
9909                 .rpc_resp = &res,
9910                 .rpc_cred = cred,
9911         };
9912         int status;
9913
9914         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
9915         if (res.notification & ~args.notify_types)
9916                 dprintk("%s: unsupported notification\n", __func__);
9917         if (res.notification != args.notify_types)
9918                 pdev->nocache = 1;
9919
9920         trace_nfs4_getdeviceinfo(server, &pdev->dev_id, status);
9921
9922         dprintk("<-- %s status=%d\n", __func__, status);
9923
9924         return status;
9925 }
9926
9927 int nfs4_proc_getdeviceinfo(struct nfs_server *server,
9928                 struct pnfs_device *pdev,
9929                 const struct cred *cred)
9930 {
9931         struct nfs4_exception exception = { };
9932         int err;
9933
9934         do {
9935                 err = nfs4_handle_exception(server,
9936                                         _nfs4_proc_getdeviceinfo(server, pdev, cred),
9937                                         &exception);
9938         } while (exception.retry);
9939         return err;
9940 }
9941 EXPORT_SYMBOL_GPL(nfs4_proc_getdeviceinfo);
9942
9943 static void nfs4_layoutcommit_prepare(struct rpc_task *task, void *calldata)
9944 {
9945         struct nfs4_layoutcommit_data *data = calldata;
9946         struct nfs_server *server = NFS_SERVER(data->args.inode);
9947
9948         nfs4_setup_sequence(server->nfs_client,
9949                         &data->args.seq_args,
9950                         &data->res.seq_res,
9951                         task);
9952 }
9953
9954 static void
9955 nfs4_layoutcommit_done(struct rpc_task *task, void *calldata)
9956 {
9957         struct nfs4_layoutcommit_data *data = calldata;
9958         struct nfs_server *server = NFS_SERVER(data->args.inode);
9959
9960         if (!nfs41_sequence_done(task, &data->res.seq_res))
9961                 return;
9962
9963         switch (task->tk_status) { /* Just ignore these failures */
9964         case -NFS4ERR_DELEG_REVOKED: /* layout was recalled */
9965         case -NFS4ERR_BADIOMODE:     /* no IOMODE_RW layout for range */
9966         case -NFS4ERR_BADLAYOUT:     /* no layout */
9967         case -NFS4ERR_GRACE:        /* loca_recalim always false */
9968                 task->tk_status = 0;
9969                 break;
9970         case 0:
9971                 break;
9972         default:
9973                 if (nfs4_async_handle_error(task, server, NULL, NULL) == -EAGAIN) {
9974                         rpc_restart_call_prepare(task);
9975                         return;
9976                 }
9977         }
9978 }
9979
9980 static void nfs4_layoutcommit_release(void *calldata)
9981 {
9982         struct nfs4_layoutcommit_data *data = calldata;
9983
9984         pnfs_cleanup_layoutcommit(data);
9985         nfs_post_op_update_inode_force_wcc(data->args.inode,
9986                                            data->res.fattr);
9987         put_cred(data->cred);
9988         nfs_iput_and_deactive(data->inode);
9989         kfree(data);
9990 }
9991
9992 static const struct rpc_call_ops nfs4_layoutcommit_ops = {
9993         .rpc_call_prepare = nfs4_layoutcommit_prepare,
9994         .rpc_call_done = nfs4_layoutcommit_done,
9995         .rpc_release = nfs4_layoutcommit_release,
9996 };
9997
9998 int
9999 nfs4_proc_layoutcommit(struct nfs4_layoutcommit_data *data, bool sync)
10000 {
10001         struct rpc_message msg = {
10002                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTCOMMIT],
10003                 .rpc_argp = &data->args,
10004                 .rpc_resp = &data->res,
10005                 .rpc_cred = data->cred,
10006         };
10007         struct rpc_task_setup task_setup_data = {
10008                 .task = &data->task,
10009                 .rpc_client = NFS_CLIENT(data->args.inode),
10010                 .rpc_message = &msg,
10011                 .callback_ops = &nfs4_layoutcommit_ops,
10012                 .callback_data = data,
10013                 .flags = RPC_TASK_MOVEABLE,
10014         };
10015         struct rpc_task *task;
10016         int status = 0;
10017
10018         dprintk("NFS: initiating layoutcommit call. sync %d "
10019                 "lbw: %llu inode %lu\n", sync,
10020                 data->args.lastbytewritten,
10021                 data->args.inode->i_ino);
10022
10023         if (!sync) {
10024                 data->inode = nfs_igrab_and_active(data->args.inode);
10025                 if (data->inode == NULL) {
10026                         nfs4_layoutcommit_release(data);
10027                         return -EAGAIN;
10028                 }
10029                 task_setup_data.flags = RPC_TASK_ASYNC;
10030         }
10031         nfs4_init_sequence(&data->args.seq_args, &data->res.seq_res, 1, 0);
10032         task = rpc_run_task(&task_setup_data);
10033         if (IS_ERR(task))
10034                 return PTR_ERR(task);
10035         if (sync)
10036                 status = task->tk_status;
10037         trace_nfs4_layoutcommit(data->args.inode, &data->args.stateid, status);
10038         dprintk("%s: status %d\n", __func__, status);
10039         rpc_put_task(task);
10040         return status;
10041 }
10042
10043 /*
10044  * Use the state managment nfs_client cl_rpcclient, which uses krb5i (if
10045  * possible) as per RFC3530bis and RFC5661 Security Considerations sections
10046  */
10047 static int
10048 _nfs41_proc_secinfo_no_name(struct nfs_server *server, struct nfs_fh *fhandle,
10049                     struct nfs_fsinfo *info,
10050                     struct nfs4_secinfo_flavors *flavors, bool use_integrity)
10051 {
10052         struct nfs41_secinfo_no_name_args args = {
10053                 .style = SECINFO_STYLE_CURRENT_FH,
10054         };
10055         struct nfs4_secinfo_res res = {
10056                 .flavors = flavors,
10057         };
10058         struct rpc_message msg = {
10059                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SECINFO_NO_NAME],
10060                 .rpc_argp = &args,
10061                 .rpc_resp = &res,
10062         };
10063         struct nfs4_call_sync_data data = {
10064                 .seq_server = server,
10065                 .seq_args = &args.seq_args,
10066                 .seq_res = &res.seq_res,
10067         };
10068         struct rpc_task_setup task_setup = {
10069                 .rpc_client = server->client,
10070                 .rpc_message = &msg,
10071                 .callback_ops = server->nfs_client->cl_mvops->call_sync_ops,
10072                 .callback_data = &data,
10073                 .flags = RPC_TASK_NO_ROUND_ROBIN,
10074         };
10075         const struct cred *cred = NULL;
10076         int status;
10077
10078         if (use_integrity) {
10079                 task_setup.rpc_client = server->nfs_client->cl_rpcclient;
10080
10081                 cred = nfs4_get_clid_cred(server->nfs_client);
10082                 msg.rpc_cred = cred;
10083         }
10084
10085         nfs4_init_sequence(&args.seq_args, &res.seq_res, 0, 0);
10086         status = nfs4_call_sync_custom(&task_setup);
10087         dprintk("<-- %s status=%d\n", __func__, status);
10088
10089         put_cred(cred);
10090
10091         return status;
10092 }
10093
10094 static int
10095 nfs41_proc_secinfo_no_name(struct nfs_server *server, struct nfs_fh *fhandle,
10096                            struct nfs_fsinfo *info, struct nfs4_secinfo_flavors *flavors)
10097 {
10098         struct nfs4_exception exception = {
10099                 .interruptible = true,
10100         };
10101         int err;
10102         do {
10103                 /* first try using integrity protection */
10104                 err = -NFS4ERR_WRONGSEC;
10105
10106                 /* try to use integrity protection with machine cred */
10107                 if (_nfs4_is_integrity_protected(server->nfs_client))
10108                         err = _nfs41_proc_secinfo_no_name(server, fhandle, info,
10109                                                           flavors, true);
10110
10111                 /*
10112                  * if unable to use integrity protection, or SECINFO with
10113                  * integrity protection returns NFS4ERR_WRONGSEC (which is
10114                  * disallowed by spec, but exists in deployed servers) use
10115                  * the current filesystem's rpc_client and the user cred.
10116                  */
10117                 if (err == -NFS4ERR_WRONGSEC)
10118                         err = _nfs41_proc_secinfo_no_name(server, fhandle, info,
10119                                                           flavors, false);
10120
10121                 switch (err) {
10122                 case 0:
10123                 case -NFS4ERR_WRONGSEC:
10124                 case -ENOTSUPP:
10125                         goto out;
10126                 default:
10127                         err = nfs4_handle_exception(server, err, &exception);
10128                 }
10129         } while (exception.retry);
10130 out:
10131         return err;
10132 }
10133
10134 static int
10135 nfs41_find_root_sec(struct nfs_server *server, struct nfs_fh *fhandle,
10136                     struct nfs_fsinfo *info)
10137 {
10138         int err;
10139         struct page *page;
10140         rpc_authflavor_t flavor = RPC_AUTH_MAXFLAVOR;
10141         struct nfs4_secinfo_flavors *flavors;
10142         struct nfs4_secinfo4 *secinfo;
10143         int i;
10144
10145         page = alloc_page(GFP_KERNEL);
10146         if (!page) {
10147                 err = -ENOMEM;
10148                 goto out;
10149         }
10150
10151         flavors = page_address(page);
10152         err = nfs41_proc_secinfo_no_name(server, fhandle, info, flavors);
10153
10154         /*
10155          * Fall back on "guess and check" method if
10156          * the server doesn't support SECINFO_NO_NAME
10157          */
10158         if (err == -NFS4ERR_WRONGSEC || err == -ENOTSUPP) {
10159                 err = nfs4_find_root_sec(server, fhandle, info);
10160                 goto out_freepage;
10161         }
10162         if (err)
10163                 goto out_freepage;
10164
10165         for (i = 0; i < flavors->num_flavors; i++) {
10166                 secinfo = &flavors->flavors[i];
10167
10168                 switch (secinfo->flavor) {
10169                 case RPC_AUTH_NULL:
10170                 case RPC_AUTH_UNIX:
10171                 case RPC_AUTH_GSS:
10172                         flavor = rpcauth_get_pseudoflavor(secinfo->flavor,
10173                                         &secinfo->flavor_info);
10174                         break;
10175                 default:
10176                         flavor = RPC_AUTH_MAXFLAVOR;
10177                         break;
10178                 }
10179
10180                 if (!nfs_auth_info_match(&server->auth_info, flavor))
10181                         flavor = RPC_AUTH_MAXFLAVOR;
10182
10183                 if (flavor != RPC_AUTH_MAXFLAVOR) {
10184                         err = nfs4_lookup_root_sec(server, fhandle,
10185                                                    info, flavor);
10186                         if (!err)
10187                                 break;
10188                 }
10189         }
10190
10191         if (flavor == RPC_AUTH_MAXFLAVOR)
10192                 err = -EPERM;
10193
10194 out_freepage:
10195         put_page(page);
10196         if (err == -EACCES)
10197                 return -EPERM;
10198 out:
10199         return err;
10200 }
10201
10202 static int _nfs41_test_stateid(struct nfs_server *server,
10203                 nfs4_stateid *stateid,
10204                 const struct cred *cred)
10205 {
10206         int status;
10207         struct nfs41_test_stateid_args args = {
10208                 .stateid = stateid,
10209         };
10210         struct nfs41_test_stateid_res res;
10211         struct rpc_message msg = {
10212                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_TEST_STATEID],
10213                 .rpc_argp = &args,
10214                 .rpc_resp = &res,
10215                 .rpc_cred = cred,
10216         };
10217         struct rpc_clnt *rpc_client = server->client;
10218
10219         nfs4_state_protect(server->nfs_client, NFS_SP4_MACH_CRED_STATEID,
10220                 &rpc_client, &msg);
10221
10222         dprintk("NFS call  test_stateid %p\n", stateid);
10223         nfs4_init_sequence(&args.seq_args, &res.seq_res, 0, 1);
10224         status = nfs4_call_sync_sequence(rpc_client, server, &msg,
10225                         &args.seq_args, &res.seq_res);
10226         if (status != NFS_OK) {
10227                 dprintk("NFS reply test_stateid: failed, %d\n", status);
10228                 return status;
10229         }
10230         dprintk("NFS reply test_stateid: succeeded, %d\n", -res.status);
10231         return -res.status;
10232 }
10233
10234 static void nfs4_handle_delay_or_session_error(struct nfs_server *server,
10235                 int err, struct nfs4_exception *exception)
10236 {
10237         exception->retry = 0;
10238         switch(err) {
10239         case -NFS4ERR_DELAY:
10240         case -NFS4ERR_RETRY_UNCACHED_REP:
10241                 nfs4_handle_exception(server, err, exception);
10242                 break;
10243         case -NFS4ERR_BADSESSION:
10244         case -NFS4ERR_BADSLOT:
10245         case -NFS4ERR_BAD_HIGH_SLOT:
10246         case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
10247         case -NFS4ERR_DEADSESSION:
10248                 nfs4_do_handle_exception(server, err, exception);
10249         }
10250 }
10251
10252 /**
10253  * nfs41_test_stateid - perform a TEST_STATEID operation
10254  *
10255  * @server: server / transport on which to perform the operation
10256  * @stateid: state ID to test
10257  * @cred: credential
10258  *
10259  * Returns NFS_OK if the server recognizes that "stateid" is valid.
10260  * Otherwise a negative NFS4ERR value is returned if the operation
10261  * failed or the state ID is not currently valid.
10262  */
10263 static int nfs41_test_stateid(struct nfs_server *server,
10264                 nfs4_stateid *stateid,
10265                 const struct cred *cred)
10266 {
10267         struct nfs4_exception exception = {
10268                 .interruptible = true,
10269         };
10270         int err;
10271         do {
10272                 err = _nfs41_test_stateid(server, stateid, cred);
10273                 nfs4_handle_delay_or_session_error(server, err, &exception);
10274         } while (exception.retry);
10275         return err;
10276 }
10277
10278 struct nfs_free_stateid_data {
10279         struct nfs_server *server;
10280         struct nfs41_free_stateid_args args;
10281         struct nfs41_free_stateid_res res;
10282 };
10283
10284 static void nfs41_free_stateid_prepare(struct rpc_task *task, void *calldata)
10285 {
10286         struct nfs_free_stateid_data *data = calldata;
10287         nfs4_setup_sequence(data->server->nfs_client,
10288                         &data->args.seq_args,
10289                         &data->res.seq_res,
10290                         task);
10291 }
10292
10293 static void nfs41_free_stateid_done(struct rpc_task *task, void *calldata)
10294 {
10295         struct nfs_free_stateid_data *data = calldata;
10296
10297         nfs41_sequence_done(task, &data->res.seq_res);
10298
10299         switch (task->tk_status) {
10300         case -NFS4ERR_DELAY:
10301                 if (nfs4_async_handle_error(task, data->server, NULL, NULL) == -EAGAIN)
10302                         rpc_restart_call_prepare(task);
10303         }
10304 }
10305
10306 static void nfs41_free_stateid_release(void *calldata)
10307 {
10308         struct nfs_free_stateid_data *data = calldata;
10309         struct nfs_client *clp = data->server->nfs_client;
10310
10311         nfs_put_client(clp);
10312         kfree(calldata);
10313 }
10314
10315 static const struct rpc_call_ops nfs41_free_stateid_ops = {
10316         .rpc_call_prepare = nfs41_free_stateid_prepare,
10317         .rpc_call_done = nfs41_free_stateid_done,
10318         .rpc_release = nfs41_free_stateid_release,
10319 };
10320
10321 /**
10322  * nfs41_free_stateid - perform a FREE_STATEID operation
10323  *
10324  * @server: server / transport on which to perform the operation
10325  * @stateid: state ID to release
10326  * @cred: credential
10327  * @privileged: set to true if this call needs to be privileged
10328  *
10329  * Note: this function is always asynchronous.
10330  */
10331 static int nfs41_free_stateid(struct nfs_server *server,
10332                 const nfs4_stateid *stateid,
10333                 const struct cred *cred,
10334                 bool privileged)
10335 {
10336         struct rpc_message msg = {
10337                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FREE_STATEID],
10338                 .rpc_cred = cred,
10339         };
10340         struct rpc_task_setup task_setup = {
10341                 .rpc_client = server->client,
10342                 .rpc_message = &msg,
10343                 .callback_ops = &nfs41_free_stateid_ops,
10344                 .flags = RPC_TASK_ASYNC | RPC_TASK_MOVEABLE,
10345         };
10346         struct nfs_free_stateid_data *data;
10347         struct rpc_task *task;
10348         struct nfs_client *clp = server->nfs_client;
10349
10350         if (!refcount_inc_not_zero(&clp->cl_count))
10351                 return -EIO;
10352
10353         nfs4_state_protect(server->nfs_client, NFS_SP4_MACH_CRED_STATEID,
10354                 &task_setup.rpc_client, &msg);
10355
10356         dprintk("NFS call  free_stateid %p\n", stateid);
10357         data = kmalloc(sizeof(*data), GFP_KERNEL);
10358         if (!data)
10359                 return -ENOMEM;
10360         data->server = server;
10361         nfs4_stateid_copy(&data->args.stateid, stateid);
10362
10363         task_setup.callback_data = data;
10364
10365         msg.rpc_argp = &data->args;
10366         msg.rpc_resp = &data->res;
10367         nfs4_init_sequence(&data->args.seq_args, &data->res.seq_res, 1, privileged);
10368         task = rpc_run_task(&task_setup);
10369         if (IS_ERR(task))
10370                 return PTR_ERR(task);
10371         rpc_put_task(task);
10372         return 0;
10373 }
10374
10375 static void
10376 nfs41_free_lock_state(struct nfs_server *server, struct nfs4_lock_state *lsp)
10377 {
10378         const struct cred *cred = lsp->ls_state->owner->so_cred;
10379
10380         nfs41_free_stateid(server, &lsp->ls_stateid, cred, false);
10381         nfs4_free_lock_state(server, lsp);
10382 }
10383
10384 static bool nfs41_match_stateid(const nfs4_stateid *s1,
10385                 const nfs4_stateid *s2)
10386 {
10387         if (s1->type != s2->type)
10388                 return false;
10389
10390         if (memcmp(s1->other, s2->other, sizeof(s1->other)) != 0)
10391                 return false;
10392
10393         if (s1->seqid == s2->seqid)
10394                 return true;
10395
10396         return s1->seqid == 0 || s2->seqid == 0;
10397 }
10398
10399 #endif /* CONFIG_NFS_V4_1 */
10400
10401 static bool nfs4_match_stateid(const nfs4_stateid *s1,
10402                 const nfs4_stateid *s2)
10403 {
10404         return nfs4_stateid_match(s1, s2);
10405 }
10406
10407
10408 static const struct nfs4_state_recovery_ops nfs40_reboot_recovery_ops = {
10409         .owner_flag_bit = NFS_OWNER_RECLAIM_REBOOT,
10410         .state_flag_bit = NFS_STATE_RECLAIM_REBOOT,
10411         .recover_open   = nfs4_open_reclaim,
10412         .recover_lock   = nfs4_lock_reclaim,
10413         .establish_clid = nfs4_init_clientid,
10414         .detect_trunking = nfs40_discover_server_trunking,
10415 };
10416
10417 #if defined(CONFIG_NFS_V4_1)
10418 static const struct nfs4_state_recovery_ops nfs41_reboot_recovery_ops = {
10419         .owner_flag_bit = NFS_OWNER_RECLAIM_REBOOT,
10420         .state_flag_bit = NFS_STATE_RECLAIM_REBOOT,
10421         .recover_open   = nfs4_open_reclaim,
10422         .recover_lock   = nfs4_lock_reclaim,
10423         .establish_clid = nfs41_init_clientid,
10424         .reclaim_complete = nfs41_proc_reclaim_complete,
10425         .detect_trunking = nfs41_discover_server_trunking,
10426 };
10427 #endif /* CONFIG_NFS_V4_1 */
10428
10429 static const struct nfs4_state_recovery_ops nfs40_nograce_recovery_ops = {
10430         .owner_flag_bit = NFS_OWNER_RECLAIM_NOGRACE,
10431         .state_flag_bit = NFS_STATE_RECLAIM_NOGRACE,
10432         .recover_open   = nfs40_open_expired,
10433         .recover_lock   = nfs4_lock_expired,
10434         .establish_clid = nfs4_init_clientid,
10435 };
10436
10437 #if defined(CONFIG_NFS_V4_1)
10438 static const struct nfs4_state_recovery_ops nfs41_nograce_recovery_ops = {
10439         .owner_flag_bit = NFS_OWNER_RECLAIM_NOGRACE,
10440         .state_flag_bit = NFS_STATE_RECLAIM_NOGRACE,
10441         .recover_open   = nfs41_open_expired,
10442         .recover_lock   = nfs41_lock_expired,
10443         .establish_clid = nfs41_init_clientid,
10444 };
10445 #endif /* CONFIG_NFS_V4_1 */
10446
10447 static const struct nfs4_state_maintenance_ops nfs40_state_renewal_ops = {
10448         .sched_state_renewal = nfs4_proc_async_renew,
10449         .get_state_renewal_cred = nfs4_get_renew_cred,
10450         .renew_lease = nfs4_proc_renew,
10451 };
10452
10453 #if defined(CONFIG_NFS_V4_1)
10454 static const struct nfs4_state_maintenance_ops nfs41_state_renewal_ops = {
10455         .sched_state_renewal = nfs41_proc_async_sequence,
10456         .get_state_renewal_cred = nfs4_get_machine_cred,
10457         .renew_lease = nfs4_proc_sequence,
10458 };
10459 #endif
10460
10461 static const struct nfs4_mig_recovery_ops nfs40_mig_recovery_ops = {
10462         .get_locations = _nfs40_proc_get_locations,
10463         .fsid_present = _nfs40_proc_fsid_present,
10464 };
10465
10466 #if defined(CONFIG_NFS_V4_1)
10467 static const struct nfs4_mig_recovery_ops nfs41_mig_recovery_ops = {
10468         .get_locations = _nfs41_proc_get_locations,
10469         .fsid_present = _nfs41_proc_fsid_present,
10470 };
10471 #endif  /* CONFIG_NFS_V4_1 */
10472
10473 static const struct nfs4_minor_version_ops nfs_v4_0_minor_ops = {
10474         .minor_version = 0,
10475         .init_caps = NFS_CAP_READDIRPLUS
10476                 | NFS_CAP_ATOMIC_OPEN
10477                 | NFS_CAP_POSIX_LOCK,
10478         .init_client = nfs40_init_client,
10479         .shutdown_client = nfs40_shutdown_client,
10480         .match_stateid = nfs4_match_stateid,
10481         .find_root_sec = nfs4_find_root_sec,
10482         .free_lock_state = nfs4_release_lockowner,
10483         .test_and_free_expired = nfs40_test_and_free_expired_stateid,
10484         .alloc_seqid = nfs_alloc_seqid,
10485         .call_sync_ops = &nfs40_call_sync_ops,
10486         .reboot_recovery_ops = &nfs40_reboot_recovery_ops,
10487         .nograce_recovery_ops = &nfs40_nograce_recovery_ops,
10488         .state_renewal_ops = &nfs40_state_renewal_ops,
10489         .mig_recovery_ops = &nfs40_mig_recovery_ops,
10490 };
10491
10492 #if defined(CONFIG_NFS_V4_1)
10493 static struct nfs_seqid *
10494 nfs_alloc_no_seqid(struct nfs_seqid_counter *arg1, gfp_t arg2)
10495 {
10496         return NULL;
10497 }
10498
10499 static const struct nfs4_minor_version_ops nfs_v4_1_minor_ops = {
10500         .minor_version = 1,
10501         .init_caps = NFS_CAP_READDIRPLUS
10502                 | NFS_CAP_ATOMIC_OPEN
10503                 | NFS_CAP_POSIX_LOCK
10504                 | NFS_CAP_STATEID_NFSV41
10505                 | NFS_CAP_ATOMIC_OPEN_V1
10506                 | NFS_CAP_LGOPEN
10507                 | NFS_CAP_MOVEABLE,
10508         .init_client = nfs41_init_client,
10509         .shutdown_client = nfs41_shutdown_client,
10510         .match_stateid = nfs41_match_stateid,
10511         .find_root_sec = nfs41_find_root_sec,
10512         .free_lock_state = nfs41_free_lock_state,
10513         .test_and_free_expired = nfs41_test_and_free_expired_stateid,
10514         .alloc_seqid = nfs_alloc_no_seqid,
10515         .session_trunk = nfs4_test_session_trunk,
10516         .call_sync_ops = &nfs41_call_sync_ops,
10517         .reboot_recovery_ops = &nfs41_reboot_recovery_ops,
10518         .nograce_recovery_ops = &nfs41_nograce_recovery_ops,
10519         .state_renewal_ops = &nfs41_state_renewal_ops,
10520         .mig_recovery_ops = &nfs41_mig_recovery_ops,
10521 };
10522 #endif
10523
10524 #if defined(CONFIG_NFS_V4_2)
10525 static const struct nfs4_minor_version_ops nfs_v4_2_minor_ops = {
10526         .minor_version = 2,
10527         .init_caps = NFS_CAP_READDIRPLUS
10528                 | NFS_CAP_ATOMIC_OPEN
10529                 | NFS_CAP_POSIX_LOCK
10530                 | NFS_CAP_STATEID_NFSV41
10531                 | NFS_CAP_ATOMIC_OPEN_V1
10532                 | NFS_CAP_LGOPEN
10533                 | NFS_CAP_ALLOCATE
10534                 | NFS_CAP_COPY
10535                 | NFS_CAP_OFFLOAD_CANCEL
10536                 | NFS_CAP_COPY_NOTIFY
10537                 | NFS_CAP_DEALLOCATE
10538                 | NFS_CAP_SEEK
10539                 | NFS_CAP_LAYOUTSTATS
10540                 | NFS_CAP_CLONE
10541                 | NFS_CAP_LAYOUTERROR
10542                 | NFS_CAP_READ_PLUS
10543                 | NFS_CAP_MOVEABLE,
10544         .init_client = nfs41_init_client,
10545         .shutdown_client = nfs41_shutdown_client,
10546         .match_stateid = nfs41_match_stateid,
10547         .find_root_sec = nfs41_find_root_sec,
10548         .free_lock_state = nfs41_free_lock_state,
10549         .call_sync_ops = &nfs41_call_sync_ops,
10550         .test_and_free_expired = nfs41_test_and_free_expired_stateid,
10551         .alloc_seqid = nfs_alloc_no_seqid,
10552         .session_trunk = nfs4_test_session_trunk,
10553         .reboot_recovery_ops = &nfs41_reboot_recovery_ops,
10554         .nograce_recovery_ops = &nfs41_nograce_recovery_ops,
10555         .state_renewal_ops = &nfs41_state_renewal_ops,
10556         .mig_recovery_ops = &nfs41_mig_recovery_ops,
10557 };
10558 #endif
10559
10560 const struct nfs4_minor_version_ops *nfs_v4_minor_ops[] = {
10561         [0] = &nfs_v4_0_minor_ops,
10562 #if defined(CONFIG_NFS_V4_1)
10563         [1] = &nfs_v4_1_minor_ops,
10564 #endif
10565 #if defined(CONFIG_NFS_V4_2)
10566         [2] = &nfs_v4_2_minor_ops,
10567 #endif
10568 };
10569
10570 static ssize_t nfs4_listxattr(struct dentry *dentry, char *list, size_t size)
10571 {
10572         ssize_t error, error2, error3;
10573
10574         error = generic_listxattr(dentry, list, size);
10575         if (error < 0)
10576                 return error;
10577         if (list) {
10578                 list += error;
10579                 size -= error;
10580         }
10581
10582         error2 = nfs4_listxattr_nfs4_label(d_inode(dentry), list, size);
10583         if (error2 < 0)
10584                 return error2;
10585
10586         if (list) {
10587                 list += error2;
10588                 size -= error2;
10589         }
10590
10591         error3 = nfs4_listxattr_nfs4_user(d_inode(dentry), list, size);
10592         if (error3 < 0)
10593                 return error3;
10594
10595         return error + error2 + error3;
10596 }
10597
10598 static void nfs4_enable_swap(struct inode *inode)
10599 {
10600         /* The state manager thread must always be running.
10601          * It will notice the client is a swapper, and stay put.
10602          */
10603         struct nfs_client *clp = NFS_SERVER(inode)->nfs_client;
10604
10605         nfs4_schedule_state_manager(clp);
10606 }
10607
10608 static void nfs4_disable_swap(struct inode *inode)
10609 {
10610         /* The state manager thread will now exit once it is
10611          * woken.
10612          */
10613         struct nfs_client *clp = NFS_SERVER(inode)->nfs_client;
10614
10615         nfs4_schedule_state_manager(clp);
10616 }
10617
10618 static const struct inode_operations nfs4_dir_inode_operations = {
10619         .create         = nfs_create,
10620         .lookup         = nfs_lookup,
10621         .atomic_open    = nfs_atomic_open,
10622         .link           = nfs_link,
10623         .unlink         = nfs_unlink,
10624         .symlink        = nfs_symlink,
10625         .mkdir          = nfs_mkdir,
10626         .rmdir          = nfs_rmdir,
10627         .mknod          = nfs_mknod,
10628         .rename         = nfs_rename,
10629         .permission     = nfs_permission,
10630         .getattr        = nfs_getattr,
10631         .setattr        = nfs_setattr,
10632         .listxattr      = nfs4_listxattr,
10633 };
10634
10635 static const struct inode_operations nfs4_file_inode_operations = {
10636         .permission     = nfs_permission,
10637         .getattr        = nfs_getattr,
10638         .setattr        = nfs_setattr,
10639         .listxattr      = nfs4_listxattr,
10640 };
10641
10642 const struct nfs_rpc_ops nfs_v4_clientops = {
10643         .version        = 4,                    /* protocol version */
10644         .dentry_ops     = &nfs4_dentry_operations,
10645         .dir_inode_ops  = &nfs4_dir_inode_operations,
10646         .file_inode_ops = &nfs4_file_inode_operations,
10647         .file_ops       = &nfs4_file_operations,
10648         .getroot        = nfs4_proc_get_root,
10649         .submount       = nfs4_submount,
10650         .try_get_tree   = nfs4_try_get_tree,
10651         .getattr        = nfs4_proc_getattr,
10652         .setattr        = nfs4_proc_setattr,
10653         .lookup         = nfs4_proc_lookup,
10654         .lookupp        = nfs4_proc_lookupp,
10655         .access         = nfs4_proc_access,
10656         .readlink       = nfs4_proc_readlink,
10657         .create         = nfs4_proc_create,
10658         .remove         = nfs4_proc_remove,
10659         .unlink_setup   = nfs4_proc_unlink_setup,
10660         .unlink_rpc_prepare = nfs4_proc_unlink_rpc_prepare,
10661         .unlink_done    = nfs4_proc_unlink_done,
10662         .rename_setup   = nfs4_proc_rename_setup,
10663         .rename_rpc_prepare = nfs4_proc_rename_rpc_prepare,
10664         .rename_done    = nfs4_proc_rename_done,
10665         .link           = nfs4_proc_link,
10666         .symlink        = nfs4_proc_symlink,
10667         .mkdir          = nfs4_proc_mkdir,
10668         .rmdir          = nfs4_proc_rmdir,
10669         .readdir        = nfs4_proc_readdir,
10670         .mknod          = nfs4_proc_mknod,
10671         .statfs         = nfs4_proc_statfs,
10672         .fsinfo         = nfs4_proc_fsinfo,
10673         .pathconf       = nfs4_proc_pathconf,
10674         .set_capabilities = nfs4_server_capabilities,
10675         .decode_dirent  = nfs4_decode_dirent,
10676         .pgio_rpc_prepare = nfs4_proc_pgio_rpc_prepare,
10677         .read_setup     = nfs4_proc_read_setup,
10678         .read_done      = nfs4_read_done,
10679         .write_setup    = nfs4_proc_write_setup,
10680         .write_done     = nfs4_write_done,
10681         .commit_setup   = nfs4_proc_commit_setup,
10682         .commit_rpc_prepare = nfs4_proc_commit_rpc_prepare,
10683         .commit_done    = nfs4_commit_done,
10684         .lock           = nfs4_proc_lock,
10685         .clear_acl_cache = nfs4_zap_acl_attr,
10686         .close_context  = nfs4_close_context,
10687         .open_context   = nfs4_atomic_open,
10688         .have_delegation = nfs4_have_delegation,
10689         .alloc_client   = nfs4_alloc_client,
10690         .init_client    = nfs4_init_client,
10691         .free_client    = nfs4_free_client,
10692         .create_server  = nfs4_create_server,
10693         .clone_server   = nfs_clone_server,
10694         .discover_trunking = nfs4_discover_trunking,
10695         .enable_swap    = nfs4_enable_swap,
10696         .disable_swap   = nfs4_disable_swap,
10697 };
10698
10699 static const struct xattr_handler nfs4_xattr_nfs4_acl_handler = {
10700         .name   = XATTR_NAME_NFSV4_ACL,
10701         .list   = nfs4_xattr_list_nfs4_acl,
10702         .get    = nfs4_xattr_get_nfs4_acl,
10703         .set    = nfs4_xattr_set_nfs4_acl,
10704 };
10705
10706 #if defined(CONFIG_NFS_V4_1)
10707 static const struct xattr_handler nfs4_xattr_nfs4_dacl_handler = {
10708         .name   = XATTR_NAME_NFSV4_DACL,
10709         .list   = nfs4_xattr_list_nfs4_dacl,
10710         .get    = nfs4_xattr_get_nfs4_dacl,
10711         .set    = nfs4_xattr_set_nfs4_dacl,
10712 };
10713
10714 static const struct xattr_handler nfs4_xattr_nfs4_sacl_handler = {
10715         .name   = XATTR_NAME_NFSV4_SACL,
10716         .list   = nfs4_xattr_list_nfs4_sacl,
10717         .get    = nfs4_xattr_get_nfs4_sacl,
10718         .set    = nfs4_xattr_set_nfs4_sacl,
10719 };
10720 #endif
10721
10722 #ifdef CONFIG_NFS_V4_2
10723 static const struct xattr_handler nfs4_xattr_nfs4_user_handler = {
10724         .prefix = XATTR_USER_PREFIX,
10725         .get    = nfs4_xattr_get_nfs4_user,
10726         .set    = nfs4_xattr_set_nfs4_user,
10727 };
10728 #endif
10729
10730 const struct xattr_handler *nfs4_xattr_handlers[] = {
10731         &nfs4_xattr_nfs4_acl_handler,
10732 #if defined(CONFIG_NFS_V4_1)
10733         &nfs4_xattr_nfs4_dacl_handler,
10734         &nfs4_xattr_nfs4_sacl_handler,
10735 #endif
10736 #ifdef CONFIG_NFS_V4_SECURITY_LABEL
10737         &nfs4_xattr_nfs4_label_handler,
10738 #endif
10739 #ifdef CONFIG_NFS_V4_2
10740         &nfs4_xattr_nfs4_user_handler,
10741 #endif
10742         NULL
10743 };